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1.
1) The World of Facebook.

2) The subculture of Facebook users considered as a whole.

3a) An individual Facebook user's circle of Facebook friends, friends of friends, etc. The size limited only by how many Facebookers can see that idividual's Facebook profile.

3b) One's personal social network on Facebook.

Note: Often preceded by "the."
Status update: Aaron Aaronson is thinking about buying a car. Does the FaceWorld have any suggestions?

Dude, my FaceWorld is filled with Farmvillians!
You know you can hide that crap on your news feed, right?
What?! Dude, you just saved my life!
Yeah... that's... great.
by Bearcat40 June 22, 2010