Patent attributes
A sender holds a first platform account with an interaction system. The sender selects a content item to be shared with a recipient. In response to determining that a recipient identifier of the recipient is not linked to a platform account, an off-platform communication is transmitted to a second user device associated with the recipient identifier. The off-platform communication is in an electronic format supported by the second user device and contains a user-selectable registration link. In response to detecting establishment of a second platform account linked to the recipient identifier, the recipient is enabled to access the content item on the second user device via a user interface provided by an interaction application. A relationship between the first platform account and the second platform account is established within the interaction system.
