can OP post where he got the information? its no an English text there.
if facebook had attempted to create a virtual money and have failed, what makes them sure they will succeed today? even if they use blockchain of their own as long as they keep the data of a user, i will always use my fake account in facebook. but i may trade with it so long as it gets listed on big exchanges.
this has been a somewhat viral news, if you search google you will find it.
besides who cares about Facebook and what they are doing. they are the most centralized company that you can think of and all the information that goes into them will also go to 3 letter agencies in US. nobody will be interested in using the coin that they create.