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I accidentally blocked an IP address that Facebook claimed it may be a security threat, but then I realized I shouldn't have blocked it; is there anywhere I can see the blocked locations and unblock them?

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I don't think facebook blocks anything like that....
Its no security of any kind..lol

If you could explain what you blocked it with, wouldn't be any problem getting instruction on the reversal of what happened...

All I can guess, is it was a browser addon or firwall at this point......
What browser do you use?
What firewall?
What OS?

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Try posting a screen shot here of what you are talking about...
When you get the same type of blocked message again...
Then we may be able to help more, and tell you whats doing it and go from there...
GL