20. One or more computer-readable non-transitory storage media embodying software that is operable when executed to: receive an indication of a first user action by a first user; when the indication is received: determine a topic of the first user action based at least in part on analyzing content associated with the first user action; determine whether the first user has indicated a preference to exclude posts associated with the topic or a category associated with the topic; and in response to a determination that the first user has not indicated any preference to exclude posts associated with the topic or the category, then: identify a second user action by a second user and related to the topic; determine whether the first user has indicated a preference to exclude posts associated with the second user; and in response to a determination that the first user has not indicated any preference to exclude posts associated with the second user, providing the first user with access to the second user action, wherein the access enables the first user to interact with the second user action.
22. The media of claim 20 , wherein the access to the second user action comprises a topic-profile page corresponding to the topic.