9. The computer readable storage medium of claim 8 , wherein selecting questions based on tags related to the selected topic further comprises: selecting questions based on tags hierarchically under the tag corresponding to the selected topic.
8. A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to: retrieve profile information related to a user of the social networking system, the profile information including the user's affinity and the user's connections' affinities for each of a plurality of tags, each tag associated with a question topic; select a set of questions stored in the social networking system based on question topics associated with the plurality of tags and the user's connections' affinities for each of the plurality of tags; for each question in the set of questions: determine a score for the question based on the user's affinities for a subset of the plurality of tags associated with the question; adjust the score for the question based on one or more activities performed by the user in relation to another question associated with the subset of the plurality of tags; sort the questions based on the adjusted scores for the questions; and provide one or more of the sorted questions in a question interface for display to the user.