I'm doing similar thing. But the problem is that if you make your "e-personality" (your comments, forum posts, published creations) dependent on monopoly such as FB, it may lock your account and e.g. ask for... scan of ID document! Yes, it happened before. ID is full of sensitive data, you can take a loan with it, transfer of such data is highly regulated, but if someone is monopoly regulations are not obligatory for them. So avoid relying too much on FB with nickname.