If you're using Intercom, this tiny app will automatically follow your users two days after they register. It will easily show your new users your Twitter account and increase your followers.
Add this App to Heroku and supply the following environment variables:
TWITTER_ACCESS_TOKENTWITTER_ACCESS_TOKEN_SECRETINTERCOM_APP_IDINTERCOM_API_KEYREDIS_URLTWITTER_CONSUMER_KEYTWITTER_CONSUMER_SECRET
Log into Intercom and create the webhook (https://docs.intercom.io/integrations/webhooks). It should point to https://my-app-on-heroku.herokuapp.com/webhook
That's it.