If this really happens and facebook will release its cryptocurrency, then this news will bring a huge number of new users to the cryptocurrency market, which will certainly have a positive effect on development.
Facebook has taken a key approach to cryptocurrency because they haven't really given anything. It is still a question for what GlobalCoin will be used but the BBC has suggested that Facebook might look at retailers to allow their users to buy goods and get discounts using stablecoin.
In addition, this Cryptocurrency will be used to transfer money directly from Facebook to retailers, eliminating credit card companies as intermediaries.