11. A method comprising: maintaining in a social networking system a plurality of user profiles for users of the social networking system; maintaining in the social networking system a plurality of objects, the objects associated with metadata fields; logging a plurality of activities by users of the social networking system with respect to the objects; receiving a submission of content for an object from a user, the submission including an asserted value for a metadata field for the object; evaluating the submission, using a computing device, to determine whether to add the asserted value to the metadata field for the object, evaluating the submission comprising: evaluating the veracity of the asserted value for the metadata field based on the user's profile and the user's logged activities; maintaining, as part of the user profiles, connections between users profiles; determining a degree of diversity between one of the submitting users and one or more other submitting users, the degree of diversity based on the connections between the submitting user's profile and the other submitting users' profiles; and evaluating the submission of the user based the degree of diversity; and responsive to the evaluation, adding the asserted value to the metadata field for the object, and prompting the user to provide additional submissions for other objects by organizing and displaying the other objects into a plurality of groups, the groups determined based on the user's profile and the user's logged activities.
13. The method of claim 11 wherein the groups displayed are determined based on an expected evaluation of a future submission by the user.