Colleges, Universities and Offices tend to stop you being social online. They sometimes block the best social websites. Good practice is to not use these websites at such places (Don’t try to be social online in colleges or offices. You have got colleagues or college mates to do that) but in case of some important stuff or emergency, you can use web proxy sites and servers to unblock YouTube, Orkut, FaceBook, MySpace, Twitter. And you can use Google to unblock any blocked website. Precisely speaking, Google can serve to be a proxy server itself.