Technologies are disclosed for a computing system that allows users to control the disclosure of their identities during communication sessions. Users can control the disclosure of their identities with respect to certain types of shared content. In one mode of operation, a user can share content anonymously. In another mode of operation, identity may be revealed when certain conditions are met or revealed to only certain other users. For example, the identity of a user who shared a comment anonymously may be revealed if multiple other users agree with that comment. In another mode of operation, the user's identity is revealed to all other users such as in a live video stream. The computing system can control display of users' identities based on user instructions or based on triggering conditions. A user interface (UI) can show content items that identify a user together with content items that are shared anonymously.