I will probably use it but still treat it as any other fiat currency with censorship, government regulations, freezing/seizing of fund etc.. My main fund will definitely be held in a decentralized coin with my private keys under my control.
I am looking at Facebook's GlobalCoin with both eyes open for possibilities yet cautious for its potential. Well, we still don't have the clear and full picture of this platform more than its name. It seems to be seen how things will turn out for this Facebook venture. But one thing for sure: Facebook and the people behind this cryptocurrency will do everything they can to make it a grand success but how the market will respond that is something we are excitedly watching.