Absurd, ridiculous, nonsensical, unlikely, and/or untruthful things people post on Facebook.
Tiffany just said she is engaged to Darryl's brother and that they have twins on the way. The wedding is supposed to be in April. That's a bunch of facebunk if you ask me!
by thingoneandthingtwo February 22, 2012
Mundane details about one's day that are posted to a social networking site in the hopes that one of your friends with an equally mundane life will comment on your status.
Jack : I planted an herb garden today, then took a nap - what a great day...

Comment from Sue: Wow, that is a great day!!! But that's major Face Bunk - Get a life...
by Ida Dunnher April 16, 2009

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