"I was very closely involved for the integration, had full access to the source code, did plenty of review, and have a lot of confidence in the engineers that are maintaining it.
There are plenty of engineers in the world who are capable of inspecting the binaries they're distributing, so it would be incredibly risky of them to inject surveillance code client side."
I guess that the governmenet doesn't even need a backdoor in the Facebook app... Since Google has admin privileges on your device and is in bed with the NSA, they could go that route instead.
Then again, Moxie said he himself oversaw the implementation of the encryption and that he has trust in it...