I can't think of one for all of them, but here goes.
1. No idea, anyone can come across as nice on the internet. 'karkingjack' below is fair nice and funny in his answers
2, most don't have real pics to judge by..
3. umm, 'i hate work', and 'big d***us', but they're rude in a good way and actually pretty funny
4. 'ArtistBboy', 'selfishstars', 'evangelina' (cause she's brutally honest), that's all I can think of off the top of my head
5. The guy that keeps asking girls in new jersey to kick him in the balls, the guy that keeps saying his friend caught him wearing pink panties, that girl that has posted like 1000 questions about how she needs to lose her virginity soon or else she's doomed but still hasn't and continues to ask questions all the time about it, and every person who has posted a 'am I pretty? rate me out of 10' question.