Then that doesn't really help anything here. I asked how would this trigger anti-trust proceedings because Facebook is not abusing a monopoly position, they're

Then that doesn't really help anything here. I asked how would this trigger anti-trust proceedings because Facebook is not abusing a monopoly position, they're just not letting other services post to their site. You responded by basically saying "Yeah, but people think they are". Which really doesn't address anything. So I asked more directly what do they have a monopoly on. I know people think they're a monopoly. I think those people are wrong. At least until they can tell me a monopoly on what.