OPEN

The Common Data Project in NYC analysed the privacy policies of 10 of the most popular websites and found some interesting recurring themes. For instance:

"Private Data Not Covered By Policy
Yes, that's right. In some policies, there is data collected through sites and services but not covered within the legal terms of any binding privacy policy. An example of this is the way third party advertisers will handle your data. In other words, any data collected by outside advertisers on a particular site isn't protected."