There won’t be one says Zuckerberg.
There will. They will, as someone pointed out to me, follow Amazon, in a way.
It won’t be iOS (‘cos it can’t be), but the same obfuscated Android that Amazon pioneered.
Apps, Facebook Apps
Voice calls, Facebook Messenger
TXTs, Facebook Messenger
Some kind of browser to follow links.
Price like the Kindle.
When 25% of your time on a smart phone is Facebook, you might as well have a Facebook phone.
Zuckerberg likes to be in charge.