A toidiot or twidiot is a person that writes utterly foolish or senseless crap on the internet especially on twitter and facebook or any other social networking site.
Joe Blow posted on twitter that he didn't know who Michael Jackson was. Joe Blow is a toidiot
-extreme over-exaggeration; to describe something and go completely over the top; turning a mole hill into a mountain; telling stories with added information to make them sound more outrageous; total embellishment; an overstatement.
Sheila saw a guy with long hair across the street.
Sheila: "I JUST SAW FABIO!!!!" (seemingly believing herself)