I have no idea if they do this, but they should partially or fully sponsor weddings of couples that met on their service in exchange for a small ad at the venue. There's a captive audience of potentially lots of single people watching two people that met on their service get married. It's a great advertising opportunity. I'd have happily put a "This wedding brought to you by OK-Cupid" banner at the bar at my wedding for $500 or $1000 towards the open bar.