Reading a fairly uninteresting article in the New Yorker (may require login) about Facebook and the downside / dark side of unfettered free speech.  The most interesting part was about the later writings of Martin Luther.

The Dark Side of Techno-Utopianism

Big technological shifts have always empowered reformers. They have also empowered bigots, hucksters, and propagandists.

From Wikipedia:

Martin Luther and antisemitism