Yes if this facebook launch their own alts then of course there's a trading pairs to btc and some alts so crypto market will grow

Then base in many users and we know facebook is very popular worldwide i'm sure their coin will turn popular too in no time like many users that here in crypto prepare some money by using this and i think we are secure in this because Mark Zuckerberg is the developer of this fb coin like he is very trusted already then he think for the modern future of people worldwide