Turns out that "it depends"; a recent paper by Jon Kleinberg, Sid Suri and others suggests that for wikipedia edits, social networks are more important predicto

Turns out that "it depends"; a recent paper by Jon Kleinberg, Sid Suri and others suggests that for wikipedia edits, social networks are more important predictors, where as for Live Journal, "similarity networks" are better. For hard data google the paper (it's a preprint so I'm not gonna link to it): Sid Suri site:cs.cornell.edu, and checkout the Papers link.