There are a few blogs covering this subject in detail that I know of: facebookfails.com/ and www.lamebook.com

No need to re invent the blogs here. Why not make a list of links to blogs that make you laugh instead?

I have a couple of favorites at the moment:

www.peopleofwalmart.com/
http://asleeponthesubway.tumblr.com/
hotchickspickingupdog****.com (substitute the **** with the four letter word that is the same as poo)

and if you have any worthy submissions to my blog please post - I need more content:

www.peopleontrains.com