Russian here. Most comments here are pure nonsense. The only reason Facebook risks getting blocked is because in Russia it is predominantly used by dissidents and people in opposition to Putin's regime. It doesn't block groups, events, etc at Kremlin's behest. So it should be blocked. Upd: many commenters here clearly misread my comment, or maybe it's my poor English. "It should be blocked" means that it is in Putin'…
(Or did you mean that therefore it was logical for Putin to block FB? Or, well, maybe you wrote something different from what you wanted to write, not being a native English speaker)