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Twitter, rebranded to X, is a company and a microblogging social media platform. Twitter as a platform was founded in March 2006 by Biz Stone, Evan Williams, Jack Dorsey, and Noah Glass in San Francisco, California. It is one of the top-visited websites in the world. Originally designed for Odeo employees, Twitter was publicly launched in July 2006. The platform spun off into its own company, Twitter Inc., in April 2007. Twitter, Inc. was renamed to X Corp. in April 2023. On July 23, 2023, it was announced that Twitter would be rebranding to X. The process is ongoing.

Twitter was purchased by entrepreneur and Tesla CEO Elon Musk in October 2022 for $44 billion. Upon his acquisition, Musk became Twitter's CEO. His takeover and significant changes to the website have since been met with controversy and polarized many users. The number of monthly active Twitter users in 2022 was reported to be anywhere between 368 and 450 million. In December 2022, Insider Intelligence predicted that the number of monthly active users, based on a figure of 368.4 million, would drop by 3.9 percent in 2023 and 5 percent in 2024 due to company turmoil. More than 6,000 employees, 80 percent of Twitter's workforce, have been laid off since Musk's acquisition. On June 5, 2023, Linda Yaccarino officially took over as CEO of Twitter.

Posts made on Twitter, known as tweets, are designed to be short-form. It began as an SMS-based platform, and as such, the number of characters was limited to 140 until 2017, when it was doubled to 280. The majority of tweets average fifty characters. As of June 2023, paid subscribers of Twitter Blue can post tweets of up to 25,000 characters. Twitter generates the majority of its revenue––about 90 percent––from advertising, and the remaining 10 percent is from licensing user data.

Twitter originated in March 2006 as Twttr, a short-form communication service between employees of a podcasting company called Odeo. After Apple introduced a podcasting feature to iTunes in late 2005 and announced that it would be built into all future iPods, Odeo was in need of a new business model. Odeo employee Jack Dorsey came up with the idea of a short messaging service (SMS)-based system in which a message sent to one number would be broadcast to multiple people. Twttr proved highly popular among Odeo employees, with some users racking up monthly SMS bills worth hundreds of dollars. Dorsey said that Twitter's name was based on the definition of the word: a short burst of inconsequential information, or chirps from birds. The original shortening of the name to Twttr was partly because the twitter.com domain was already in use. It was also inspired by the company name Flickr, as well as by the standard length of American SMS short codes of five numbers.

The first published tweet on Twitter, posted by cofounder Jack Dorsey.

Twitter was launched on March 21, 2006, with cofounder Jack Dorsey's first tweet: "just setting up my twttr." The site was made public––no longer just for use by Odeo employees––on July 15, 2006. In the fall of 2006, Odeo CEO and Twitter cofounder Evan Williams purchased the shares of Odeo's investors, saying he felt bad about the company's lack of growth. This resulted in his ownership of Odeo (and Twitter, as Odeo's venture). The exact amount he paid is unknown, but it is estimated to be around $5 million. After purchasing the company, Williams fired fellow Twitter creator Noah Glass. Glass's role in creating Twitter has since been heavily ignored, as has Florian Weber's. Weber is not often recognized as an official founder of Twitter, although he was involved in developing the site since Jack Dorsey's conception of the idea.

Twitter spun off into its own company in April 2007. The website gained significant traction during the 2007 South By Southwest (SXSW) Interactive conference, where it was a popular topic of discussion. After the conference, the daily average of tweets rose from 20,000 to 60,000. By 2009, a number of high-profile celebrities had joined Twitter, including Ashton Kutcher, Britney Spears, Oprah Winfrey, and Shaquille O'Neal. Twitter introduced account verification in June 2009 after a number of celebrities complained that they were being impersonated. In July 2009, hyperlinks were added to hashtags, enabling users to explore all tweets under the same hashtag. The retweeting feature was added in November 2009.

Twitter's logo history.

In September 2010, the Twitter platform underwent a major redesign. Tweets were equipped with a details panel that revealed information about the tweet, including related content and embedded media files. The update introduced infinite scrolling to the site and mini user profiles that were viewable without the need to navigate off the current page. In addition, the first version of the Twitter bird logo––named Larry the Bird after Larry Bird––was created. Twitter's interface was tweaked again in December 2011 with the Fly redesign, which included the Connect and Discover tabs and made the site more intuitive for users. The design of the bird logo was simplified in June 2012, and its name was changed from Larry the Bird to the Twitter bird.

Twitter acquired the now defunct video sharing company Vine for $30 million in October 2012 and released the app of the same name in January 2013. Vine was a short-form video creation and sharing platform that limited video uploads to six seconds. The platform was shut down in October 2016 after a steady loss of users and advertisers to Snapchat and Instagram; the two platforms introduced their own short-form video features in 2013, shortly after Vine's release. Twitter made an unsuccessful attempt to sell Vine before shutting the app and company down.

From left to right: cofounders Jack Dorsey, Biz Stone, Evan Williams, and CEO Dick Costolo at the NYSE on Twitter's IPO date.

On November 7, 2013, Twitter launched its initial public offering (IPO) at $26 per share. A few hours into the day, the stock was listed on the New York Stock Exchange (NYSE) under the ticker TWTR at an opening share price of $45.10. It peaked for the day at $50.09 and closed at $44.90, leaving Twitter with a market value of nearly $24.5 billion. The IPO turned cofounders Dorsey and Williams into billionaires. Some analysts claimed the stock's valuation was too high for its opening day. In early 2014, TWTR's price reached over $70, its highest value so far and the second-highest in the stock's history. It then saw a quick and significant drop from which it did not recover for years. By the end of 2014, the stock's value was under $40, about half of the year's peak. TWTR was eventually delisted from the NYSE in November 2022 after Elon Musk's purchase of Twitter was finalized.

In April 2014, Twitter redesigned its user profile pages to mimic those of Facebook. Changes included larger profile pictures, cover images, and pinned tweets. In January 2015, Twitter acquired Periscope, a livestreaming app that had yet to be launched, for $100 million and a significant stock compensation package. The acquisition was not announced until March. Periscope remained a separate app from Twitter. It hosted both live broadcasts and recently recorded ones, allowing them to be streamed either publicly or privately. In May 2016, Twitter announced that various elements of tweets, including attached media, links, and handles in reply tweets, would no longer count against the character limit.

Rumors of a potential sale of Twitter began in September 2016 after speculation on Wall Street was reported by Reuters and CNBC. Reputed possible buyers included Alphabet, Salesforce, and The Walt Disney Company. Twitter announced on October 5, 2016, that it was seeking to conclude sales negotiations by the end of the month after the company's third-quarter earnings were reported. Within two days of the announcement, most of the potential buyers––with the exception of Salesforce––had decided not to bid, which resulted in a 20 percent drop in TWTR share prices. A few days later, Salesforce announced it would not bid on Twitter. This led the share price to drop by an additional 8 percent. Salesforce claimed it had decided not to acquire Twitter due to the platform's inefficiency in dealing with online trolls and abuse.

In an effort to differentiate itself from its competitors, Twitter expanded its focus into livestreaming in 2016, when the company began securing rights to stream live news and events. On December 14, 2016, Twitter launched the ability for users to livestream video directly on the platform. In early 2017, Twitter declared its intention to stream double the amount of live content that year than was streamed in 2016. In May 2017, Twitter announced upcoming livestreaming partnership plans with nearly a dozen organizations, including Bloomberg Media, Live Nation, and BuzzFeed. By September 2017, Twitter had nearly 200 content partners.

In November 2017, tweet character limits were expanded from 140 to 280 for all languages except Japanese, Chinese, and Korean. The decision was criticized by some who felt that the limit increase would negatively affect Twitter's content and appearance. A data review conducted one year later found that only 12 percent of tweets were longer than 140 characters, with 1 percent of those tweets being 280 characters. On October 30, 2019, Twitter announced it would ban political ads on the platform due to concerns of organizations and candidates "paying for reach." The ban was enforced beginning on November 22, 2019, and lifted in January 2023 after Elon Musk's takeover.

Twitter, along with several social media companies, experienced fewer negative financial effects from the Covid-19 pandemic than many other industries. It saw an influx in users during the start of the pandemic. The number of monetizable daily active users (mDAUs) in Q2 of 2020 was 186 million, a 34 percent increase from the year before and the highest quarterly yearly growth rate since Twitter began reporting mDAU growth levels. Though Twitter saw significantly more usage during the start of the pandemic, revenue was down by $683 million, or about 19 percent from the year before. Twitter's stock took a small hit at the beginning of 2020 but climbed to historically higher levels over the course of the year and throughout 2021. TWTR closed at an all-time high of $77.63 in early 2021. The company's annual revenue for 2021 was $5.08 billion, a 37 percent increase year over year. By early 2022, the stock had plunged to mid-2020 levels––between $30 and $40 per share––but the company's revenue remained high. Twitter's 2022 Q1 revenue was $1.2 billion, and mDAUs were up to 229 million.

Birdwatch, a fact-checking program intended to fight the spread of misinformation on Twitter, was piloted in January 2021 to a limited audience. Participating users were able to add contextual notes to tweets; at its time of launch, notes were only viewable through the public Birdwatch website. Birdwatch notes first became visible on Twitter to pilot participants in June 2021 and were available to all US users in October 2022. In November 2022, Birdwatch was renamed Community Notes.

An example of a warning label for a tweet with misinformation.

On March 1, 2021, Twitter began applying warning labels to tweets containing misleading information about Covid-19 vaccines. The policy included a strike system, in which repeat offenders had their accounts temporarily suspended; five strikes resulted in a permanent ban. Under Elon Musk's leadership, the practice was discontinued in November 2022. The decision disappointed health officials, who were concerned that the spread of misinformation would result in fewer people getting vaccinated.

Spaces, a live audio conversation feature, was launched in May 2021. It was first rolled out to a limited number of users in 2020 for testing. Spaces allowed for users with 600 or more followers to host live audio conversations with other users. In June 2021, Twitter began rolling out Twitter Blue, a paid subscription that offered users exclusive features. Among the first features were Bookmark Folders, to organize saved tweets; Undo Tweet, to remove a tweet shortly after sending it; and Reader Mode, to simplify the formatting of long tweet threads. Twitter Blue first launched in Australia and Canada for $4.49 AUD and $3.49 CAD, respectively. The service launched in the United States for $2.99 and New Zealand for $4.49 NZD on November 9, 2021. More features were added with the expansion, including access to ad-free news articles through Twitter.

On May 25, 2022, the Federal Trade Commission (FTC) ordered Twitter to pay a $150 million fine for profiting off of the advertising of user information in direct violation of a 2011 order that prohibited the company from misrepresenting its privacy and security practices. Twitter had collected the phone numbers and email addresses of its users under the pretense of account security purposes but instead sold the information to advertisers.

Musk began purchasing shares of Twitter in January 2022. By early April of that year, he revealed in a regulatory filing that he owned 9 percent of Twitter's shares, making him the company's largest shareholder. The announcement led share prices to rise to almost $50. Musk then made an offer to buy Twitter at $54.20 per share but rescinded it shortly after, leading Twitter to sue him in July 2022. He counter-sued, resulting in the share price dropping to $33. After a drawn-out legal battle between the two parties, Musk went through with his original agreement to purchase Twitter for $54.20 per share at a total valuation of $44 billion. His stated reason for buying Twitter is to make it a bigger platform for free speech. Twitter has been accused of political bias against conservative and right-wing content. Musk's acquisition was largely viewed as detrimental to the company's future, due to his history as a controversial figure who often makes unpredictable decisions.

The sale was completed on October 27, 2022. On the same day, Musk fired CEO Parag Agrawal and CFO Ned Segal. More top executives were fired throughout the following week; some resigned. Multiple employees reported they had been locked out of their email and Slack accounts with no notice. In addition, Musk laid off 4,400 of Twitter's 5,500 contractors and half of its rank-and-file staff––about 3,700 people––citing revenue and cost challenges. He has since made plans to cut $1 billion from Twitter’s infrastructure costs. Musk's acquisition made Twitter a private company. On October 28, a notification of its listing removal from the NYSE was filed with the United States Securities and Exchange Commission (SEC). The stock closed the previous day at $53.70. TWTR was officially delisted from the exchange on November 8, 2022. Shareholders were paid $54.20 per share.

A week and a half after the mass layoff, Musk emailed the remaining employees about major changes to the company moving forward. One email informed staff of the end of the remote-work-for-all policy, which would force workers back to the office with few exceptions. Another email stated that going forward, all employees would be required to work "long hours at high intensity" to meet Musk's goal of a new and "extremely hardcore" Twitter. Employees were required to respond to the email, which was sent at midnight, with their decision by 5 P.M. eastern time that day. Those who did not respond or chose not to stay were to receive three months severance. Around 1,200 employees refused the new terms and resigned.

Following Musk's acquisition, several major companies pulled their advertisements from the platform, including General Mills, United Airlines Holdings, General Motors, Pfizer, and Audi. Twitter's revenue has since dropped massively. In November 2022, Musk stated that Twitter was losing $4 million a day. Musk's takeover has also resulted in a considerable loss of Twitter users, including some notable celebrities. An estimated 877,000 accounts were deactivated in the week following the acquisition, more than twice the normal number in the same amount of time. Instances of hate speech on Twitter have increased since Musk's day of purchase. This has been attributed to his absolutist free speech attitude and the precedent set by his reinstatement of previously banned accounts, including the account of former US President Donald Trump, who was banned following the attempted insurrection of the United States Capitol on January 6, 2021. Other unbanned accounts under his leadership included Marjorie Taylor Greene, Andrew Tate, Babylon Bee, Kathy Griffin, Jordan Peterson, and Kanye West. Approximately 60,000 accounts were reinstated. In addition, Musk temporarily suspended the accounts of multiple high-profile journalists for sharing links that showed the location of his private jet. Journalists whose accounts were suspended included Ryan Mac, Donie O’Sullivan, Micah Lee, and Tony Webster.

On December 18, 2022, Musk posted a poll on Twitter asking if he should step down as CEO and claiming he would "abide by the results." The poll garnered over 17.5 million votes with 57.5 percent voting yes and 42.5 percent voting no. On December 20, 2022, Musk announced his plans to step down as CEO upon finding a replacement, who he said would be "someone foolish enough to take the job." He plans to instead lead Twitter's software and server teams. Another small round of company layoffs occurred on December 22, 2022. At this point, over one hundred former employees had either filed arbitration demands or class action lawsuits against Twitter regarding the layoffs.

On January 19, 2023, Twitter officially banned third-party clients and apps from its platform, disallowing them from being paired with Twitter's application programming interface (API). The ban was quietly initiated days beforehand when the company suspended access to third-party apps without notice. Over 200 Twitter employees were laid off in February 2023, slashing its existing workforce by 10 percent. Musk acknowledged the job cuts in a tweet, stating "Hope you have a good Sunday. First day of the rest of your life." In March 2023, Musk announced that in an effort to combat bots, only verified users would be able to vote in polls and have their tweets appear in recommendations to other users. The policy was enacted on April 15.

In April 2023, Twitter’s parent company, Twitter, Inc., was renamed to X Corp. The name change was a result of Musk's aspiration to create an "everything app" called X. Described as a worldwide version of WeChat, X would offer features like video chats, messaging, streaming, and payments. In May 2023, Twitter was estimated to be worth only one-third of the $44 billion Musk paid for it in his acquisition. On May 11, 2023, Musk announced that a new unnamed CEO would take over Twitter in six weeks. The following day, he stated the new CEO was Linda Yaccarino. Yaccarino officially took over as CEO on June 5, 2023.

On June 30, 2023, Twitter began blocking unregistered users from viewing tweets as a "temporary emergency measure." Musk stated that Twitter was being data pillaged to the point of degrading site services. The restrictions were partially reversed days later on July 5. Unregistered users can view individual tweets through direct links but cannot view tweet replies or profile pages without an account. On July 1, 2023, Musk introduced daily limits on how many tweets users can view. Verified and existing unverified accounts were limited to viewing 6,000 and 600 posts a day, respectively. Newly created unverified accounts were restricted to 300. The limits were increased twice later that same day, finishing at a total of 10,000 posts for verified users, 1,000 for existing unverified users, and 500 for new unverified users.

Twitter's homepage on July 24, 2023.

On July 23, 2023, Musk began the rebranding of Twitter to X, starting with a logo change from the company's long-standing bird to the letter X. The bird logo was removed from the website the following day, and the homepage was changed to reflect the new logo. On July 25, Musk changed the design of the X logo to one with slightly thicker lines, but reversed the change that same day. However, he stated the logo would continue to evolve.

Regarding the company's rebranding, CEO Linda Yaccarino tweeted, "X is the future state of unlimited interactivity––centered in audio, video, messaging, payments/banking––creating a global marketplace for ideas, goods, services, and opportunities. Powered by AI, X will connect us all in ways we’re just beginning to imagine.” Musk also acknowledged the change in a tweet, stating, “In the months to come, we will add comprehensive communications and the ability to conduct your entire financial world. The Twitter name does not make sense in that context, so we must bid adieu to the bird.” Under the rebrand, tweets would instead be called “x’s.” The name change has been met with controversy, and analysts have predicted significant future financial consequences for the company. Daniel Ives, an analyst for Wedbush Securities, predicted a $2–5 billion loss in company value, while other analysts predicted $4–20 billion.

Twitter may face future legal problems in its effort to rebrand to X, as other major companies, including Meta and Microsoft, have existing intellectual property rights to the letter. In total, there are almost 900 active trademark registrations for X in the United States. While this factor opens Twitter up to the possibility of a lawsuit or litigation from other owners, the possibility has been deemed unlikely unless an owner believes Twitter is encroaching on their brand equity. As of July 24, 2023, the URL x.com redirects to twitter.com, although some users have reported that they can only view a blank page on the domain hosting site GoDaddy.com.

The outside of Twitter headquarters in San Francisco on July 24, 2023.

Removal of the Twitter sign on the company's San Francisco headquarters began on July 24, 2023. Local police interrupted the sign's removal midway through the process, leaving only the letters "er," due to a miscommunication regarding a permit for closing the street. After an investigation, police determined no crime was committed. It is unclear when the work will resume. The bird logo also remains up.

On July 25, 2023, the company changed its Twitter handle from @twitter to @x, taking it from an existing user whose handle was changed to @x12345678998765. The handle was seized without prior warning or compensation to the existing user, Gene X. Hwang, a cofounder of Orange Photography. Twitter offered Hwang an opportunity to meet with company management and receive merch, though Hwang said he would likely decline.

Twitter is a public microblogging social media platform. Posts by users are called tweets. Tweets can contain text, photos, videos, links, GIFs, and polls. They are publicly visible on a user's profile by default, but visibility can be restricted to approved followers. As a microblogging service, tweets are limited to 280 characters; the original limit was 140. Paid subscribers of Twitter Blue have a much higher character limit of 25,000. Photos and videos previously counted against a tweet's character length until 2016. Links count as twenty-three characters no matter the URL's actual length. Tweets can be equipped with hashtags by using the # character followed by a keyword related to the tweet's content. Hashtags are intended to connect tweets to general topics. Tweets equipped with hashtags are publicly searchable under that tag, which promotes them to a larger audience beyond one's followers. Through Twitter's search bar, users can search for other users or search by hashtag or keyword to find tweets under a certain topic. Tweets can be sent through the website or app. Prior to September 2019, tweets could also be sent via SMS.

In addition to posting, users can interact with tweets by other users. Tweets can be shared (called retweeting) and liked; users can also add comments to tweets by replying. A direct messaging feature is available, allowing for private communication between users. Users can be tagged in tweets using the @ character. Twitter is free to join. However, users who wish to become verified must subscribe to Twitter Blue, a paid monthly subscription that provides access to special features on the site.

Prior to Musk's acquisition, users were verified by providing Twitter with a form of legal identification. He ended this practice shortly after taking over and replaced it with a payment system tied to Twitter Blue's subscription service. The new system allowed any user to become verified for $8 per month through Twitter Blue without actual identity verification. Within hours of this change, Twitter was flooded with newly verified fake accounts for celebrities and fictional characters. After multiple users took advantage of the new system, Musk announced that any impersonation accounts must clearly be labeled as parody, and verified users who change their Twitter name will temporarily have their verification removed. Twitter Blue was suspended on November 11, 2022, to make these changes. It was relaunched one month later, on December 12, with new verification rules in place. In May 2023, it was reported that less than 1 percent of monthly active users were subscribed to Twitter Blue.