Facebook is rolling out a new app, Messenger Kids. It's coming out as a limited preview on Apple devices in the United States.
According to Sensor Tower, worldwide iOS and Android downloads of Facebook Messenger grew 5.66% from 145.3 million in Q1 2016 to 153.5M in Q1 2017
To start using Captain on Messenger, users can just add the bot to their group conversation
Starting soon, Facebook is opening up that companion app, Facebook's Messenger, to companies who will populate it with chat bots