I don't know how true but there is an article reporting that 1 million Facebook users with their private information were sold to by a Bulgarian man by the name of Bogomil Shopov for just $5.
Links to the articles
1 million Facebook users sold for $5 | Fox News
I Talk Web :@
Shopov said:
he bought the data from a user who went by "Mertem" on Gigbucks, a digital odd-jobs board where users offer to perform tasks in exchange for $5 to $50.
Facebook told Shopov:
Now we would like you to send us this file, delete it, tell us if you have given a copy of it to someone, give us the website from which you bought it including all transactions with it and the payment system and remove a couple of things from your blog. Oh and by the way, you are not allowed to disclose any part of this conversation; it is a secret that we are even having this conversation