https://blog.hartleybrody.com/fb-messenger-bot/
Build a Facebook BOT using Python and Flask
https://fossbytes.com/obamas-facebook-messenger-bot-is-now-open-source-and-available-on-github/
https://fossbytes.com/step-by-step-guide-to-build-a-weather-bot-in-slack/ https://fossbytes.com/how-to-build-a-slack-chat-bot-in-nodejs-using-botkit/