Payment system built into Facebook will be incredibly successful. Most small businesses don't even bother with a website, nowadays a Facebook group and Instagra

Payment system built into Facebook will be incredibly successful. Most small businesses don't even bother with a website, nowadays a Facebook group and Instagram account is enough - so it's only natural to process payments there as well. However, it is not going to damage Bitcoin in any way. Main use case for Bitcoin is buying drugs. No one is going to be paying for drugs with a currency tied to their real-world identity.