Did the seller request that you send payment that way, to avoid fees? If so, then I would call paypal, and explain what happened to them. Tell them you met the seller on facebook, that you purchased items, that the seller told you to send it as a gift, and then absconded with everyone's money (I am assuming that is what happened).
If so, then hopefully, they would be able to refund anyway and take it up with the seller.