Regarding it more in the details - first, there were these mass rallies all over the country, then, second, the shit in Saint Petersburg happened, and who knows what's boiling in the background and the underground still or again; it might be then that authorities in Russia behave extra-sensitive and don't take prisoners, when something like that happens what happens now in one of their most important social media platforms.
Saying, it's all a bit too much at once and this may add up to it.