April 11, 2018: On Tuesday, Facebook C.E.O. Mark Zuckerberg apologized in a congressional hearing for the abuse of data scraped from Facebook users without their permission. Testimony this week was motivated largely by reports that research firm Cambridge Analytica improperly gained access to the data from 87 million Facebook users. Zuckerberg sits before the House Energy and Commerce Committee today where he faces more questions about how and when information was shared and to what effect. The Takeaway reviews Zuckerberg's congressional testimony and what prospects of future regulation may come from it. Plus, we take a look at how Europe has been managing Facebook's oversight of user data; the announcement from GOP House Speaker Paul Ryan that he will not seek re-election; and the real-life address of Sherlock Holmes that has become embroiled in a mysterious ownership inquest.