Instapundit deactivated his Twitter account to protest SJW censorship there:
TWITTER’S GONE CRAZY BANNING PEOPLE ON THE RIGHT, so I’ve deactivated my Twitter account.
UPDATE: People seem to want more, and although there’s nothing duller than posting a screed on why you’re quitting a platform, here’s the gist: I’ve never liked Twitter even though I’ve used it. I was a late adopter, and with good reason. It’s the crystal meth of social media — addictive and destructive, yet simultaneously unsatisfying. When I’m off it I’m happier than when I’m on it. That it’s also being run by crappy SJW types who break their promises, to users, shareholders, and the government, of free speech is just the final reason. Why should I provide free content to people I don’t like, who hate me? I’m currently working on a book on social media, and I keep coming back to the point that Twitter is far and away the most socially destructive of the various platforms. So I decided to suspend them, as they are suspending others. At least I’m giving my reasons, which is more than they’ve done usually.
I left Facebook for much the same reason, whereas I was permanently suspended by Twitter. There really isn’t any good reason for anyone to the ideological right of Jeb Bush to be on these sites anymore.