Last week Silicon Valley reminded the world just how much control it now wields over the national discourse. On Tuesday, Twitter apologized for one presidential tweet and labeled two others as “false.” On Wednesday, The Wall Street Journal published an internal 2018 Facebook study acknowledging the platform promoted national “divisiveness.” A day later President Trump signed an executive order targeting social platforms’ liability immunity. Undeterred, on Friday Twitter hid an official presidential tweet for “glorifying violence” and Facebook warned the White House that it too could impose limits on government speech regarding “state use of force.”