Vampirism.

Indeed :). It is more largely based on theorisation.

Pretty much. And when mr. Dracula comes and knock on my door which isn't very likely I have an issue with the real deal vampires existing. Im not saying it's not a possibly however they're not going to be on the net bragging about it. I would think they would stay in hiding and stay to themselves. Or own their own blood bank so they wouldn't risk the chance of being exposed. But that's my two cents.