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The act of searching through someone's FaceBook Friend list, in the hope of finding more people they can add as their friend.
Question: "I just saw Jane looking through your FaceBook, what do you think she was doing?"

Reply: "Probably friend mining again... loser!"
by Troy Ginbey November 18, 2007
Searching through the friends list of your own contacts on sites like Facebook and Linkedin in the hopes of growing your own friends list for appearances' sake.
Q: How do you know Tom?

A: I don't really... I was friendmining and he is a friend of Steve's.
by retailguy August 23, 2008