Facebook is already partnering with Litecoin.
The challenge for them bringing out their own token is that, in the US, a company then puts itself under the security/banking laws if it is centralized. If they were smart, they would decentralize a token with their name on it so they wouldnt have to answer to the Feds. Of course, doing that gives up control, not something I am sure they want to do.
Wow, I'd missed news of the link up between Facebook and Lite coin (there's so much to keep track of!). I was already a lite coin fan (even more so now!).
It would make sense for Facebook to create their own token to encourage mass adoption but I understand there is plenty of red tape in the US....