1 definition by Mr. Pistachio

1.The Concept, Idea, or Action of one issuing goodwill on Facebook, or really any other social network.

2.The connotative form of definition #1, where someone makes an often futile and socially awkward attempt at socialization on a social network (such as facebook), often with no previous communication to the receiver nor any plans to follow up in real life.
Example for definition #1:

Steve: "Hey, did you know what you did at the party last night?"
Joe: "Dude, I was too smashed to remember."
Steve: "You freaking puked on Sarah! It was hilarious!"
Joe: "What?! Great, now I'm going to have to pull some Facebook Diplomacy."

Example for Definition #2
Joe: "Hey, you know that girl that gives me the stink-eye at work?"
Steve: "The one that never talks to you?"
Joe: "Yeah. She just invited me to be on her "best friends" app."
Steve: "Weird. But that's Facebook Diplomacy for yah though."
by Mr. Pistachio May 11, 2010
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