Here is a story about a class "A" jerk, who brags about his dangerous driving on a social network (BMW forum), and later gets charged with careless driving, thanks to a member who alerted police.
I could not believe what he did in a small subdivision, whereby, a lot of young families reside. Worse off, is that this happened in my neighbourhood, and to my surprise, never saw this guy or his car. However, there are a couple of other leadfoot drivers, that I've been keeping my eye on.

Link to the story.
http://ca.autos.yahoo.com/p/1914/bra...ed-by-web-post