ADWEEK - May 20 - 20th Century Fox has launched an ad campaign on Tinder for its forthcoming comedy Spy. Four of the movie's characters got fake Tinder accounts, and fans who "swipe right" can RSVP to attend a local screening. Advertising is still new territory for Tinder, with Bud Light running the app's first ads last month. Over the past six months alone, ad revenue at Grindr has grown 65%. Clients include State Farm, HotelTonight and Crunch Fitness. Advertising is still a small revenue source for dating apps. 75% of Grindr revenue comes from its ad-free paid app, which costs users $10/month.