How Reciprocity Yields Bumper Crops in Farmville

One day when going to check on my friends’ status updates on Facebook, this jumped out at me: Attention Facebook friends: Please for the love of God stop sending me gifts and invites for Farmville, Mafia Wars, Vampires, and whatever other crappy THING you’ve been playing. DO NOT WANT. Just …STOP. GOD. Those of you…