@serenawilliams - 4.8 million followers
This year, Williams won Wimbledon—matching Steffi Graf's record-tying 22 Grand Slam titles—and set a record of spending 186 weeks ranked at No. 1. And while her athletic dominance is praiseworthy on its own, one of our favorite moments of 2016 was the open letter she penned in Porter Magazine's Incredible Women of 2016 issue last week to "all incredible women who strive for excellence." The tennis superstar voiced her gripes with being defined as a great "female" athletes while LeBron James and Roger Federer are never touted among the greatest "male" athletes. She sent one of the greatest messages women everywhere should hear loud and clear: "We should never let this go unchallenged. We should always be judged by our achievements, not our gender."