Facebook's Sandberg: "I deeply regret" more not done

Facebook COO Sheryl Sandberg joined her boss Mark Zuckerberg in expressing "regret" about the company's relationship with Cambridge Analytica. She also wrote on Facebook about a responsibility to protect user data and pledged an audit of apps with access to "large amounts" of user data.

And if we find that developers misused personally identifiable information, we'll ban them from our platform and we'll tell the people who were affected.