"Terms of Service" policies on websites define how Internet businesses interact with you and use your personal information. But most web users don't read these policies — or understand that the terms are constantly changing. To track these ever-evolving documents, the Electronic Frontier Foundation (EFF) is launching "TOSBack": a "terms of service" tracker for Facebook, Google, eBay, and other major websites.

… At www.TOSBack.org, you can see a real-time feed of changes and updates to more than three dozen polices from the Internet's most popular online services. Clicking on an update brings you to a side-by-side before-and-after comparison, highlighting what has been removed from the policy and what has been added.

Source - EFF