Serena Williams Fronts br Campaign for Bumble Dating App The tennis star has become br a global adviser for the br social and dating app, Bumble, and will appear in their br upcoming ad campaign, br 'The Ball is in Her Court.' According to Reuters, the ad br will debut during the Super Bowl. Serena Williams, to Reuters Bumble's interface is unique br in that it puts the power in br the hands of its female users, with men only able to speak br to women once the woman br has sent the first message.