OK here is a interesting site DirtyPhoneBook where you can put in a person's phone number and write a comment about them. All comments are uncensored and anonymous. Needless to say you could have some fun here.
From looking around I would say alot of folks add their own phone number and do a sexual bragging. I checked my phone number and it was good to go. I'm wondering if you comment with a phone number if it then makes the phone number searchable on google?