Map/Reduce to recommend people connection
Once common feature in Social Network site is to recommend people connection. e.g. "People you may know" from Linkedin. The basic idea is very simple; if person A and person B doesn't know each other but they have a lot of common friends, then the system should recommend person B to person A and vice versa. From a graph theory perspective, for each person who is 2-degree reachable from person A, w
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http://wiki.couchapp.org/page/authn-preview