IIRC he announced this late 2017 during the bull run and was stated that he's still studying crypto and blockchain. And on latter of 2018, it's on the news that they have been hiring blockchain professionals which is an obvious act to understand that they will join and adopt the tech soon.
Creating a 'facebook coin' is likely but it's still a rumor, they have a large number of users so it will applicable to them. AFAIK, they have created sort of coins before during those restaurant city and farmville days.
It is so happy to heard this kind of a news.sure he will study those things and do something for the cryptocurrency.If that so cryptocrrencies will market as never before it will be popular in a minute
I think he's done studying about the basic things about that and that's why he decided to form a team to develop it for his social media platform. It will be a huge thing if ever it will be on the news that "Facebook has adopted blockchain and cryptocurrency".
People will buy on that and the influence that will create through Mark Zuckerberg shall be enough for the people to gain trust to cryptocurrencies and the same goes for the blockchain technology.