Morgan Beller started working on cryptocurrency and blockchain at Facebook in 2017, and was initially the only person working on Facebook's blockchain initiative.
Facebook vice president David A. Marcus moved from Facebook Messenger to a new blockchain division in May 2018.
First reports of Facebook planning a cryptocurrency, with Marcus in charge, emerged a few days later.
Confirmation that Facebook intended a cryptocurrency first emerged in May 2019.
But Facebook Inc. was banning ads on its social network that promote cryptocurrencies, initial coin offerings and binary options, since January 2018 [0]
Was Facebook decision to create a cryptocurrency, made by the end of 2017?
[0] https://fortune.com/2018/01/30/facebook-cryptocurrency-bitcoin-ad-ban/