"brute-forcing encryption on all of these is probably not possible. A small % marked as 'secret conversation'? Much easier." They probably wouldn't have to bru

"brute-forcing encryption on all of these is probably not possible. A small % marked as 'secret conversation'? Much easier." They probably wouldn't have to brute-force them. Backdooring's still quite possible - the NSA are perfectly capable of compelling Facebook to install a keylogger in their app.