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1.
The act in which a facebook user suddenly becomes crazy and A: Deletes all of their contacts, that they once liked, B: Delete every comment and or status post they've ever had on their wall until it is completely blank. or C: Deletes their entire account only to open it again 2 weeks later.

Such reasons could be cause by lack of "real" life activities, lack of "real" friends and or lack of girlfriend/boyfriend. No one knows for sure the cause of the facebook meltdown, but I'm sure we've all known at least one person to have suffered from it.
Joey had a facebook meltdown last week, he resent me a friend request because he deleted all of his friends.

Joanna had a facebook meltdown, she's deleted everything from her wall.
by turn n burn November 24, 2010