[techweenie]

There are several companies (and no doubt some government agencies) that triangulate information from Facebook and any and all other social media to build a dossier on you. For the private companies, it's all about marketing.

Paranoid fantasy? Hardly. Check out the most public of the information-gatherers: rapleaf.com (center bottom, you can opt out).

Interestingly, we see a split, where 20-somethings are happy to share everything about their lives with everyone, and the older Internet users are increasingly concerned about that knowledge. Facebook is geared to serve the 20-somethings who don't care. Imagine the different reactions to the scene in Minority Report where the billboards are talking to Anderton. The 40+ audience his horrified, the 20-something audience is titillated.