Upcoming Facebook owned cryptocurrency will be Facebook's WhatsApp messaging platform. General whatsApp users will be able to send and receive cryptocurrecncy across internationally.
Facebook cryptocurrency will be different from traditional cryptocurrency considering volatility and float freely behavior. By contrast, Facebook will hook its currency to a supervision of national currencies to give the new cryptocurrency more stability but will not get stronger to any country's existing financial system.
Not confirmed but the name of that new cryptocurrency will be “FaceCoin” and will be launched in first half of 2019.
[source: https://arstechnica.com/tech-policy/2019/02/get-ready-for-a-facebook-sponsored-cryptocurrency/
https://www.bloqtimes.com/is-facebook-working-on-its-own-cryptocurrency-called-facecoin/ ]