> I certainly wouldn't argue that the web should be real-name only, but nor do I believe everyone always has an automatic right to post on privately-owned websites using pseudonyms.

For a lot of people, Facebook is "The Web". That's all or almost all they use. The less tech-literate ones don't even know "the web", they connect to Facebook. They get their news from Facebook. They communicate on Facebook. Everything they do online, they do on Facebook.

Like someone mentioned above, when you get big enough you start to have responsibilities. When your actions affect and your voice is heard by billions of people, you're no longer "some random privately-owned website"... you're a supergiant with the ability to affect the entire world.