What does Missouri Sen. Josh Hawley have against Silicon Valley? On July 31 he tweeted (as opposed to sending by Pony Express) “Social media ‘innovation’? What innovation? Big Tech doesn’t deliver for the American people, and that’s the biggest problem of all.” The previous day the senator introduced S.2314, the Social Media Addiction Reduction Technology Act, which would smother with a giant pillow the innovation he claims not to see. Be warned: Regulation may soon arrive in Techland.

Who is this guy—and why does he think...