12. The method of claim 4 : the instructions configured to, for respective topics, identify at least one user-specific data item accessible to a user and associated with the topic; and generating the topical data feed comprising: generating a topical data feed comprising the data items associated with the topic and the at least one user-specific data item associated with the topic.
13. The method of claim 12 : at least one user-specific data item comprising an access-controlled data item that is accessible to the user; and identifying the at least one user-specific data item comprising: accessing the access-controlled data item on behalf of the user.