Twitter haters, be warned: J.K. Rowling will put you on blast. One man learned that the hard way on Saturday. It all started when the Harry Potter author went to congratulate Serena for her epic win at Wimbledon. Keep reading to see the back and forth, which J.K. ended like a boss.
Twitter has become J.K.'s go-to social media platform for communicating with the public. In May, she took to Twitter with an inspiring message for a struggling fan. If you're loving J.K.'s latest move, check out more stars who have shut down haters.