Perhaps you could provide some insight into why? I don't see how multiple personality disorder is a very useful characterization when you're describing a community made up of multiple personalities.

yodsanklai said HN is "schizophrenic" when accusing HN of being one body with two conflicting personalities: one that wants FB to emphasize freedom and the other that wants FB to police content. He said "Hopefully these aren't the same people expressing these contradictory points of view." (In my opinion, what's really happening is that there's some diversity of opinion among HNers, which is how it should be. As you point out, and yadsanklai implicitly admits, HN is not a single person so there is no self-contradiction or multiple personality disorder. Beyond that, it's a mark of intelligence for people to be able to change their minds, but I digress.)

Schizophrenia would have been appropriate if he was accusing HN of being paranoid, hearing voices, etc.

Schizophrenia is not multiple personality disorder (actually called Disassociative Identity Disorder, I just learned). I am really curious to know why people started misusing the word schizophrenia in common parlance like this.