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1.
When one posts bible verses and/or scripture on Facebook, hence congesting your News Feed. Possibly the most of annoying of all your friends. A Facebook Messiah makes one ponder the question "Why did I accept Jesus Boy's friend request?"
Brent: Goddammit!
Alex: What's the matter?
Brent: Stan keeps posting bible verses on Facebook. It's really annoying!
Alex: I believe the scientific term for that is a Facebook Messiah.
by FreedomBroGM December 08, 2011
 
2.
Person who takes-over your facebook and gets WAY more comments impersonating you, then you normally would receive.
Man you hack on to my facebook and get more comments then i would. Your the fucking Facebook Messiah
by Lo440393 February 24, 2011