textpert

noun2

1. •
   (slang) Someone who is exceptionally skilled at crafting and sending text messages.

   • Olivia Baniuszewicz is an authority on digital dating and the co-creator of Flirtexting.com. She has appeared as a textpert on NBC Today, CNN, and MTV... — 2012
2. •
   Someone skilled at analyzing texts; a literary expert or critic.

   • You don't have to be a "textpert" capable of rattling off the stats of every single monster in both the Monster Manual [...] just know enough so that you know what you're doing. — 1983