What is DM funnel?
A DM funnel is the sequence of steps a person goes through in a DM automation, and the measurement of how many pass each one: how many commented the keyword, how many received the message, how many answered the question, how many clicked the link, how many opted in. Like every funnel, the value is in the drops: a big drop between receiving and clicking points to a weak message or a link sent at the wrong time. It is what lets you improve the automation with data rather than guesswork.