Top Definition
1 - A person who has been a member of Facebook since the days when it was a college student-only network site.

2 - A person who joined Facebook when a .edu e-mail address was still required.
3 - A person who joined Facebook in 2004, or the 1st half of 2005.
"I've been on Facebook since Nov. 2004."
"Dang man, you're a Facebook O.G.!"
by TigerWoulds March 08, 2012

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