although Facebook coins can be released but I see if Facebook coins must have innovation that is greater than bitcoin in any case. this is one of the things that might be used as learning to facebook coins if you want to compete with bitcoin.
I don't think there will be competition between them. Bitcoin and Facebook coins might be cryptocurrency that has their own function. different technologies by adopting blockchain for social media I think there are already a number of ICO projects that we can make reference to. but maybe the consideration is that Facebook already has a community and maybe their own market. it will be very strong support for facebook coins on the market.