3bn what? I still "use" it in some sense, but I mostly publish auto-syndicated stuff, and read via mbasic, which uses no JavaScript and limits their surveillance. Of course I never load their "like" buttons. My parents found it useless and stopped using it; my kids can't be bothered. How much is Myspace 2.0 worth?
The number of people who do all of what you do with FB is a minuscule fraction of people. You're also not counting that Instgram, Whatsapp, and FBM have 800M, 1.4B, and 1.1B monthly active users each. With IG already likely profitable and likely to make billions in profits soon and FBM trying to begin to try to monetize. These three are prob worth at least $125B if spun out or separated hypothetically.
This is a diff world and company than MySpace. Calling it 2.0 is misguided at best.
~$520 billion as of Friday. Aside from international expansion, the difference between Facebook and MySpace is that Facebook has made and will in all likelihood continue to make a lot of money, actual profit measurable with GAAP. Snapchat will die before it makes GAAP $1, just as MySpace did.
I was trying to suggest that a lot of those "users" are not sources of income/data. I'll bet a lot of them are either bots, or humans smart enough to use an ad blocker. And most of the MAU humans are probably in a 10-year age range, having signed up when FB was useful.