LOS ANGELES (Reuters) - Tennis champion Serena Williams will star in a year-long marketing campaign for the Bumble social networking app that will kick off with a message of women’s empowerment during the Feb. 3 Super Bowl, Williams told Reuters in an interview. FILE PHOTO - Tennis - Mubadala World Tennis Championship, Abu Dhabi, United Arab Emirates - December 27, 2018 Serena Williams of the United States in action during her match against Venus Williams of the United States REUTERS/Suhaib Salem