Here is what information Facebook sends cops when a subpoena is requested by cops for investigation. I suspect what they sell to those who seek information of account holders?
Source (The document attached)
Facebook already shares its Law Enforcement Guidelines publicly, but we’ve never actually seen the data Menlo Park sends over to the cops when it gets a formal subpoena for your profile information. Now we know. This appears to be the first time we get to see what a Facebook account report looks like.
The 71-page document is actually two documents in one. The first eight pages are the actual subpoena; the remaining 62 pages are from Facebook. Most of the pages sent over from the social networking giant consist of a single photograph, plus formal details such as the image’s caption, when the image was uploaded, by whom, and who was tagged. Other information released includes Wall posts, messages, contacts, and past activity on the site.
Source (The document attached)