Why was Google absent from social media hearing?

Perhaps more than any time in our history, a handful of companies is responsible for much of the information that reaches the American public. The concentration and reach of Facebook, Twitter and Google has left us vulnerable to foreign influence and has raised concerns that the companies themselves have the power to restrict free speech. Those issues were raised during separate congressional hearings this week. Atlantic senior editor Derek Thompson joins “CBS This Morning: Saturday” to discuss the key takeaways from those hearings, why he suspects Google did not show and the threat posed by having monopolies in this space.