There are many reasons someone might block you on Facebook. 

Maybe you broke their heart and it's too painful for them to see pictures of you, or you've had a falling out and they don't want to associate with you any more.

Or maybe you're just a general pain in the arse. 

Either way, there's a way to find out if you've been given the digital cold shoulder. 

First of all, try searching for that person's name on Facebook. 

If nothing comes up, that's often a bad sign, but ask a mutual friend to check if they can find them. 

If they can, the person hasn't just deleted their account - you've been blacklisted. 

You now won't be able to view that person's profile, send them a message, or see any of their comments on Facebook. 

Awkward. 

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