Singer Rebecca Black is best known for her 2011 viral sensation "Friday." The video, which has been viewed over 110 million times, landed the then-teenage Black on talk shows and red carpets. But now the 20-year-old is opening up about the verbal abuse she suffered as a result of her fame. She penned an essay for NBC News' Think titled “What I Learned from Being a Target of Internet Hate at Age 13.