There was a new chapter in the neverending story of the federal government vs. Big Tech. And this time Mark Zuckerberg and Jack Dorsey felt the heat. The main topic was content moderation: On Capitol Hill on Tuesday, Republican Senators like Ted Cruz and Josh Hawley went particularly hard after Zuck’s Facebook and Dorsey’s Twitter. Hawley and Cruz accused both social networks of moderating posts by conservatives, including some of Donald Trump’s, more than posts by liberals -- an accusation that has not been proven.