On trolls, free speech, and private censorship

I blocked someone on Facebook today, something I almost never do. I said in the comments at Useful data, but it begs a question: Like many trolls, he thinks he has a right to say anything he wants anywhere he wants. I'm always a little surprised when believers in property act that way--it at least makes sense when anarchists do, even though they're being bad anarchists who fail to respect their