This is scary but true, or is it a matter of who cares.
Paul Venezia writes, think for a second of what Facebook knows about you. I can't say this for certain, but I think it's safe to assume that Facebook keeps everything you've ever typed into the site, whether or not you've subsequently deleted that information. If it was stored once, assume it's stored forever, even if it's no longer visible to you. This extends to photos you've untagged and anything else tied to your account.
In addition, assume all your Facebook chats are saved and archived. Your IP address is stored for every action and every time you log in. If you're using a mobile app, your exact location may be logged, and if not, your IP address is used to locate you geographically. Cross-referencing all that information gives Facebook a surprisingly clear picture of exactly who you are. Facebook can probably build a very complete profile of users who fail to enter anything other than name, rank, and serial number; the usage patterns are enough.
Read Paul Venezia's full article
How I learned to stop worrying about privacy and love Facebook Privacy - InfoWorld
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