http://www.testfreaks.com/blog/information/facebook-uid-threat-privacy/
No matter how careful you try to be, there are some numbers that uniquely identify you that you may not be aware of. And if you are a typical computer user, there is a good chance that you have at some point been on Facebook. In fact, with over 500 million users, there is a really good chance you have partaken. And if you have, there is a unique number assigned to only you – the Facebook UID.Enter a description
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