US Patent 11356521 Methods and apparatus to share online media impressions data

Methods and apparatus to share online media impression data are disclosed. An example apparatus includes a communications interface; and a web browser to send a first request to an audience measurement entity via the communications interface; and send a second request via the communications interface to cause a database proprietor to send to the audience measurement entity a cookie mapping of an audience measurement entity cookie to a database proprietor cookie corresponding to a client.