I don't seem to understand why did you put "Facebook Messages" in a line of great inventions. Isn't it just another "Live Chat"? Am i missing something?
I add it to the paradigm shifts as it resolves (in its own [large] namespace) a longstanding problem with email.
I add it to the 'transient' list as its solution is purely driven by network effects which leaves it vulnerable to the next player sideways market dissolution.