You can tell by
the cached version of the page where he sold the list that he had 1000 Google +1's for sale, Twitter email addresses and more!
So I went into facebook, clicked "Privacy Settings" and clicked "Apps, Games and Websites" then "Apps You Use"
I've never signed up for apps yet had 10 installed, some for over 6 months! Yelp, Bing, Hug Me, all sorts of shit. Deleted them real quick. Then clicked "Turn off Apps, Plugins and Websites" so now none will be installed EVER ( yeah right )
Facebook sucks!