Greet people that are about to start a conversation with you.
Welcome messages are a great way to greet people that are about to message you. You can ask them a question, give them instructions, and we even allow you to provide them with quick responses. Below is an example of mine (on https://twitter.com/specter_quotes) which includes 6 quick replies to answer my question.
Quick replies are messages that you set. The label is what their message will say if they click it and the description is just used to describe why they should choose that option.
To use this feature you must be accepting direct messages from everyone on Twitter. You can enable that here https://twitter.com/settings/safety where it says “Receive Direct Messages from anyone”.