Research by David Crandall, Lars Backstrom, Dan Cosley, Sid Suri, Dan Huttenlocher, and Jon Kleinberg was covered by the BBC World Service and New Scientist magazine and an earlier Cornell Chronicle article.

Their paper, from the Proceedings of the National Academy of Sciences in December, showed how social network links could be inferred from "geographic coincidences" on photo-sharing sites, in which geotagged photos can reveal that two people were in approximately the same place at approximately the same time on multiple occasions.