This depends a lot on which method that has been used to block facebook.
You might get in trouble if you manage to bypass this blocade.
I am sure that if you can legitimate your use of facebook, then your network manager will make this possible/available to you.
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you cant
You can't. The person who blocked you can only unblock you.
Yes. You can't do anything with them. Nothing.
No, you can not view their profile or even search them.
You can't. Not until they unblock you.