Facebook chief testifies to Congress

Zuckerberg on hate speech

He notes that artificial intelligence can already detect most Islamist extremist content, but other offensive posts are only reacted to after a user has complained to the company.

"Hate speech, I am optimistic, that over a five- to 10-year period we will have AI [artificial intelligence] tools that can get into some of the linguistic nuances of different types of content to be more accurate in flagging things for our systems.

"But today we're just not there on that.

"So a lot of this still reactive, people flag it to us, we have people look at it, we have policies to make it as not subjective as possible.

"But until we get more automated there’s a higher error rate than I am happy with."

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