Text message versus gmail, actually. And the difference makes a lot of sense since no one expects a single text to contain all the information of a reply and also texts are more likely to be time sensitive and so reducing friction to answer is good.

Annoyingly, LinkedIn's messaging system does this (both on mobile and desktop). I probably don't mean to send a two-word response to a long message from a professional contact.

But for some reason, LinkedIn has twitter envy, or at least Facebook envy.

It's like how Nature seems constantly put out that it stuck being the premier journal for high end research and wants to make it's presentation and editorial content look as much like Scientific American as possible.

Ha, that bit about Nature is spot-on.