I’ve been using this third party keyboard on my iPhone called Slash.
It turns any text input field on your phone (messenger, email, twitter, etc) into a command line interface.
This short video from Dennis Crowley’s tweet shows how it works in iMessage.
— Dennis Crowley (@dens) September 24, 2015
You can slash foursquare, soundcloud, youtube, spotify, and many other resources to help you quickly send web content and other stuff around.
It’s yet another example of the return of the command line interface.