We’ve been there already. Plenty of people called for Obama to be assassinated. (Speaking of which, and on a lighter note, there are are tons of direct reports of assassination of Lindsey Graham’s ass, particularly by men he hired to do the hit.)
I actually think that Putin and friends banning all of these social media will backfire. The Russian people are fearfully complicit, but not stupid, and hiding the truth isn’t going to stop most of them from hearing it. At some point, they are going to have had enough of that. It’s not like China, where they never had these tools to begin with and never had a habit of getting information from uncensored sources.