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> A user simply sends a message, and it’s encrypted end to end, every time.

Anything that is not public key encrypted must be considered unencrypted.

TextSecure does use public key cryptography. It performs the key exchange silently, but it still performs it.

Pff. A pair of exchanged 32GB microSD cards full of random data would give you OTPs for a hell of a lot of tweets/SMSes :)