I use it to encrypt messages to friends / customers via Facebook messager, Slack, or public forums when I'm dealing with sensitive data.

A few of my friends use this (which I wrote): http://lettergram.github.io/AnyCrypt/

You may ask, "when do you really deal with sensitive data?" My answer, is a lot more often than you think... The cool part about encryption, is I can use it over an insecure line to communicate. For example, I can post encrypted text here and only people I wrote it for can read it.