TikTok, which says it has 170 million U.S. users, made it too easy for children to create accounts and then collected data on those who did — a major violation of the Children’s Online Privacy Protection Act, known as COPPA, the Justice Department alleged in a lawsuit on Friday. But tech companies collecting and selling data from users goes far beyond TikTok — and affects everyone.Post Reports co-host Martine Powers speaks with technology reporter Drew Harwell about why the Justice Department is suing TikTok for storing the data of millions of children. And she talks with NOTUS investigative reporter Byron Tau, who shares all of the ways that apps gather information on us — and sell that information to law enforcement and governments.Plus, learn how sea lions are mapping the ocean floor with cameras attached to their backs. Check out the video here.Today’s show was produced by Emma Talkoff and Trinity Webster-Bass. It was edited by Reena Flores, with help from Arie Plotnick, and mixed by Sean Carter and Rennie Svirnovskiy. Subscribe to The Washington Post here.