Thanks to Gordon Corera Security correspondent, BBC News
Facebook has announced details of steps it is taking to remove terrorist-related content.
The move comes after growing pressure from governments for technology companies to do more to take down material such as terrorist propaganda.
In a series of blog posts by senior figures and an interview with the BBC, Facebook says it wants to be more open about the work it is doing.
The company told the BBC it was using artificial intelligence to spot images, videos and text related to terrorism as well as clusters of fake accounts.
"We want to find terrorist content immediately, before people in our community have seen it," it said.