We looked at 1.2 million opening messages (anonymized and aggregated, of course) and the results surprised even us. “Hey” gets a reply 4% of the time. A question about something specific in the other person's bio? 61%.
The winning formula is simpler than you think: notice something real, ask something open. “You climb? What's the scariest wall you've been on?” beats every pickup line ever written.
One more finding: messages sent between 7pm and 9pm get answered twice as fast. Timing isn't everything — but it helps.