President Trump threatened to impose even more tariffs on China on Thursday evening. In response, China said it will continue meeting Trump's threats with counter-actions. Global markets fell on fears of a trade war. Facebook COO Sheryl Sandberg is speaking out about the company's massive data scandal. In an interview with NBC, she said Facebook knew about the data scandal two and half years ago. Cambridge Analytica said it deleted Facebook user data, but Sandberg admits she should have followed up to make sure it happened.