Davison is actually legendary for his Internet trolling (“you have a John Davison infection” has become a diagnosis for especially newly started, science oriented blogs that draw the attention of Davison or his acolytes) and he is banned from several Science-oriented blogs, including Panda’s Thumb. He is known for setting up multiple blogs himself; each one consisting of a single post, inviting comments. Most of the comments are from himself, however. When he feels like that blog is "full", starts another one.
Also famous for trying to have blogging academics fired from their institutions for being critical of his work, or – since that doesn’t work – trying to spam them.
Diagnosis: Extraordinarily attention-seeking kook who seems to have gone completely insane. I almost feel sorry for the guy.