I was looking for someone I knew in college (20 years ago) last night, who has a very common name, and I don't know where they live now. The value of the all-e

I was looking for someone I knew in college (20 years ago) last night, who has a very common name, and I don't know where they live now. The value of the all-encompassing social network is that I should be able to narrow it down to only a handful of candidates based on their proximity to me in the social graph.