My thoughts on FB currency..
This may be one of the following szenarios:
Either its considered as "Premium Currency" like in MMORPGS ans stuff or it is taken serious..less likely..but if this happens it will be a great opportunity to invest..but not really a competition for bitcoin in points of "real" currency facts.
Bitcoin is a professional thing...FB Currency would only be recognized as a "wannabe" by the markets.
So..this may be good for investing but no cempetition for BTC or other well established Crypto-Alts like ETH or more