Zuckerberg: It was a "mistake" not to investigate Cambridge

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Facebook CEO Mark Zuckerberg says he is "sorry" for the Cambridge Analytica situation and that it was a "mistake" to trust them or any app developers to delete data after signing a legal certificate. Asked in a CNN interview Wednesday night if they should have investigated further, Zuckerberg said, "I regret that I didn't do that at the time."

Why it matters: After five days of silence from its executives, Facebook has been under enormous pressure to respond to the Cambridge Analytica scandal. In the interview, Zuckerberg didn't say much beyond what he posted earlier Wednesday on his Facebook page, and those comments failed to satisfy lawmakers who want to further investigate the company's practices.