Gatekeepers: these tech firms control what’s allowed online

Beyond Facebook and Google. The Big Tech giants have now been repeatedly called to the US Congress to testify about misinformation on social media. But they are not the only companies involved in this issue. Geoffrey A. Fowler and Chris Alcantara provide a comprehensive breakdown of the internet's gatekeepers by explaining how many other companies, stacked on top of each other, run the systems that keep it running.