They intend to use the currency in the WhatsApp application. This is their solution allowing people to use instant messenger for transactions. About this even bloomberg wrote.
[doublepost=1554988888][/doublepost]FBcoin does not affect bitcoin. Because FB will not be able to create a currency that is not subject to influence and censorship. In the decision to create my own currency, I see a way to get rid of the mediation of various payment systems, which will significantly reduce the costs of FB. As for the rest, I would prefer to send a bitcoin to a friend from a phone than through a FBcoin social network.