Google boss apologizes after ads shown on extremist videos

Yeah, that's nice PR.

Currently there is a partnership between the major infrastructure providers and the Federal government to remove, discourage and defund content that has national security implications.

This theoretically includes news, such as the Snowden Documents, which Facebook did not allow people to share on their timelines during the height of the scandal.

What are the boundaries of censorship?

It should be noted that while "extremist content" provokes images of beheadings, the very vast majority of content put out by those suffering and fighting on terrorist/freedom-fighter side (insurgent side) in the middle east, for example, is positive and are messages about their condition, what life could be like without dictatorship or foreign intervention, or about piety, family or society.

This content is censored in addition to the more brutal but less frequent content equally. But it's more controversial to specify this. So broad strokes are used to identify "extremist content".

Similar programs are underway to control the spread of perspectives by people in Russia, China, even Turkey or Israel and others.

There has been no public debate and under the Trump Administration there isn't likely to be.