Margrethe Vestager, Europe's commissioner for competition, talks with Recode's Kara Swisher in front of a live audience at Web Summit 2017 in Lisbon, Portugal. Vestager explains how the E.U. is trying to make tech companies more transparent and accountable for their dealings and why a "free" market needs government intervention to function. She says the algorithms that control what content gets surfaced on social media may "have to go to law school" before we can trust them again, and that Facebook or Snapchat's priorities cannot be allowed to supersede democracy's.