I personally won't be buying it, or any other altcoins made by big corporations. At least it's a bit of promotion for crypto currencies in general, though.
Don't be very optimistic about this coin. It can do more harm to the crypto market than good. A large chunk of the current crypto market can shift to this coin, given the huge user-base that Facebook is having currently. On top of that, Facebook may try to monopolize the crypto-market, by destroying the other cryptocurrencies such as Bitcoin and Ether.