Earlier quoted context omitted.
This perspective is interesting when applied to communications. Parlay. Courier. Pigeon. Mail. Telegraph. Telephone. Transatlantic Comms. Fax. Early Internet. Email. Text Messaging. Live Chat. Voip. Twitter. Facebook Messages. Video Chat. It's a naîve summary of communications history, but look at the persistence of some of the early players. Many have not been replaced to this day - snailmail, POTS, Fax, Email, Chat…
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.