http://downdetector.com/status/youtube
Youtube was down for 30 minutes due to DOS attack launched by Chinese communist government to disrupt the live broadcast event of Chinese billionaire in exile Guo Wengui. He planned to expose the evidence of the corruption of top Chinese government officials, but Youtube was brought down 1 and half minutes after the live broadcast began. Here is a report for another episode involving Voice of America(VOA): http://www.cnbc.com/2017/06/09/interview-with-guo-wengui-thr...