Wickr - has this and time-expiry messages (Score 1)

End to end encyryption is just one side of it, Wickr app also implements a number of UI paradigms and particularly the per-message user-set time-expiry feature that no on else has right now. This for me is the most important feature because who will own my chat data 20 years from now (be it encrypted or not)? I'd rather it be deleted when I want it, so conversations can be more ephemeral like real life.