If Facebook launches the stablecoin they are reportedly building, it will quickly become the most used product in crypto,
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here Anthony Pompliano, a crypto analyst and founder and partner at Morgan Creek Digital Assets tweets about this
https://twitter.com/APompliano/status/1075951717399838722?s=20mass adoptions in crypto is on its way

Facebook already have a blockchain team and it just matter of time for them to release their own utility tokens to be use in some of their applications. I think it's to early for them to release a stable coin and they are just making research and getting to know the blockchain technology.