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Did you know Facebook doesn't know your password?

Did you know that Facebook, Apple, or Google don't know your password? They just don't store it in their databases so hackers can't retrieve it in case they manage to break in. But if you're the only person who actually knows your password... how the hell do they know you are typing the right password to let you in?

Great tip: If the web service you use would email you your password—meaning that they actually store it—better run away from them.

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DISCUSSION

I subscribed to Tom last week or so... since then I've been voraciously going through his video history as well as his stuff on Computerphile. I love his presentation and the stuff he talks about.