House lawmakers, who had opened an investigation into the tech companies in June 2019, made the most of it. Representative Jerry Nadler, Democrat of New York, confronted Mr. Zuckerberg with the C.E.O.’s own emails, saying they showed a plot to take out a young competitor. Representative Jim Jordan, Republican of Ohio, said Google was biased and asked Mr. Pichai whether the company would change its products to help elect Joseph R. Biden for president.
In one of the sharpest exchanges, Representative Pramila Jayapal, a Washington Democrat, confronted Mr. Bezos on accusations that an Amazon lawyer had lied to the committee about how the company develops its own products. She asked him to answer whether it misused data with a yes or no.