7. The non-transitory computer-readable storage medium of claim 6 further comprising program code for: calculating a score for a candidate page in the set, the score indicating a measure of how interesting the candidate page is likely to be to a user of the client.
7. The non-transitory computer-readable storage medium of claim 6 further comprising program code for: calculating a score for a candidate page in the set, the score indicating a measure of how interesting the candidate page is likely to be to a user of the client. 8. The non-transitory computer-readable storage medium of claim 7 wherein program code for calculating the score for the candidate page comprises program code for: calculating the score responsive to extrinsic components of the candidate page, the extrinsic components including a measurement of a number of quality of interactions with the candidate page by a plurality of users of a plurality of different clients.