Facebook slips after Sheryl Sandberg says it knew about Cambridge Analytica 2.5 years ago (FB)

Facebook is down about 1.4% in early trading Friday. COO Sheryl Sandberg said the company knew about Cambridge Analytica's malicious practices over two years ago, but failed to act.   "We made mistakes and I own them and they are on me," she said.  You can track Facebook's stock price in real-time here. Facebook COO Sheryl Sandberg has been making the media rounds Thursday and Friday, giving interviews to NBC's Today Show, Bloomberg TV, the Financial Times, and others,  but it doesn't...