Yes there have been news off late. It is trying to develop a cryptocurrency which will be primarily used for remittances.
Facebook Inc. is working on making a cryptocurrency that will let users transfer money on its WhatsApp messaging app, focusing first on the remittances market in India, according to people familiar with the matter.
The user base of whatapp in India is more than 200 million and that is why it looks more attractive for them to develop their own cryptocurrency. The remittance market is also huge as many Indians staying outside are sending money to India and this figure is roughly about 70 billion in 2017 alone. That is really huge.
But what I can sense is that, they are trying to ride the blockchain wave and make a hype and develop their facebook coin. But more or less it will remain centralized in my honest opinion. However if they release their coin whatsoever be it- centralized or decentralized, it is likely to be quite big as we all know facebook is a giant in the market base. That is why it may likely be the most used coin in the world because of the ready made user base of facebook and its brand.