How can you find out who blocked you on facebook?

[funnytim]

If you cannot find them on facebook (but they had it before), there are two possibilities:

1) They blocked you
2) They deleted/deactivated their account.

A way to check this (but not fully guaranteed) is to make another account on facebook. Then try searching for the person.

If you can find them, that means they have blocked you on your "real" account

If you cannot find them, that means they either deactivated/deleted their account, OR their privacy settings are set so that no one can search for them (except friends).

Again, there is not a "definite" way to prove that, but the above may help you to try determine whether they did in fact block you or not.