Telegram
Used by 6 peopletelegram.org ↗

“The most spontaneous notes get entered into Telegram's Saved Messages feature, usually as either voice messages or text generated through iPhone voice dictation.”
Jess Levine Interview, Writer, musician, game designer · via Uses This 

“My family uses Telegram to keep in touch, and the Ardour project uses IRC, so I run a Quassel server on ardour.org and connect to it use the graphical Quassel client.”
Paul Davis Interview, Developer (Ardour, JACK) · via Uses This