It seems to me as though if you are on Facebook in the first place you should be posting, messaging, lolcats-ing with the knowledge that nothing is private - I understand the need for privacy, and concerns with identity theft etc. but have come to the possibly unfortunate, possibly sad realization that privacy, especially when the internet is concerned, is a thing of the past - I live in the UK where there is approximately one CCTV camera for every 32 people. With that knowledge, Facebook peeping on my pointless messages to friends somehow doesn't seem to concern me all that much.