I've got a question. I really am starting to think Facebook went through my Gmail contacts without me even authorizing it to do so. In the past hour, it's suggested three people I 1) Don't have any friends in common with 2) Never searched for on Facebook 3) Never contacted other than through Gmail and 4) never even worked with One guy, I used to play Team Fortress Classic with, who only I've talked to through email s…
That said, the algorithm for finding candidate pairs uses a lot of features, including past employers, schools in common, graph features other than just distance, etc. Occasionally it has a surprising success like this.