Can the launch of cryptocurrency Facebook can be a factor for the growth of Bitcoin? It is not excluded, since investments mainly in large currencies are made using Bitcoin. And I think Facebook is no exception.
The reason a lot of crypto currencies existed is because bitcoin existed. Without bitcoin and the Blockchain technology, crypto currency is not possible. That is the same with the coin which will be released by Facebook but it is not made using bitcoin. As far as I know, Libra is not that decentralized as bitcoin so in terms of that, I will always choose bitcoin.