@Des
Also, I don't post real information online as I don't want to be a target to internet-related threats
You are not a girl or a hamster, are you?

But I agree with you. People expose themselves to all kind of problems by posting their private information, pictures, videos etc. I assume the motivation to post sensitive stuff varies. But it is one thing to chat about your occupation, interests, pets, and shaving habits, and another to post your nude pictures and description of your girlfriend's favorite position (Or even better, your girlfriend's nude pictures, without telling her). The former is a normal conversation; the latter is exhibitionism and sickness. And sometimes "professionalism".
I think everybody chooses whatever suits better, a virtual friendship or a 'real' one. There is the 'virtual sex" too.
Oh, yeah, and I've almost forgotten about the "cybertwins"...