I love this video series from Jimmy Kimmel.  The problem with things like Facebook and Twitter are they allow people to be complete pant-loads at what they feel are safe distances.  Celebrities are an easy target, so Jimmy likes to have them read mean things people say about them. 

Here are the likes of Julia Roberts and Gary Oldman reading  mean things people say about them and, being the grounded celebrities they are, they find the humor in it all.