Facebook CEO Mark Zuckerberg started his long Senate hearing Tuesday with an apology and a pledge to do a better job protecting people’s data, but managed nonetheless to leave some senators disappointed on that issue and others, including efforts by the social media giant to root out “fake news.”

On data privacy, Zuckerberg admitted that even though personal information on tens of millions of users was accessed by Cambridge Analytica, no one at his company got in trouble over that incident.