I keep getting calls saying I won $ from facebook and I could go to the headquarters.

Its a scam and its all over this board.  There are lots of people running the scam calling from lots of different numbers.

The way the scam works, you have to pay some sort of fee to get the money.  The scammer keeps the fee.  Or you have to pay by giving the scammer your credit card number.  The scammer spends your card too and beyond your credit limit.  Or you have to give the scammer your bank account number.  The scammer spends all of the money in the account.

The scammer never gives you any money.  He is calling from outside the US, out of reach of US law enforcement.  He cannot be caught.