VOX.COM - Sep 25 - Dating app Hinge wrote 100 opening lines, varied by length, structure, content, etc., and then selected 22% of its users to take part in the experiment. For one month, when those users matched with someone new, they received an in-app prompt to send one of our conversation starters (the starters were randomized)," Hinge then compared response rates for the various lines. In general, lazy greetings like "hey, what's up" didn't do well. Also men are the worst at responding to messages. If they don't get a note immediately after matching, the odds of a reply fall 25%.