My take:

Companies like Tumblr, Facebook, and, at least for now, Pinterest, are moderators of new public squares; as companies, they have the ability to define what are and are not acceptable topics for public discussion on platforms that have become hubs for our cultural and civic life.

staff:

One of the great things about Tumblr is that people use it for just about every conceivable kind of expression. People being people, though, that means that Tumblr sometimes gets used for things that are just wrong. We are deeply committed to supporting and defending our users’ freedom of speech,…