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People are angry because a video of the killings in Christchurch is still on social media. A terrorist shot and killed 50 worshippers at two mosques. He live-streamed the shootings on Facebook. Many people think social media sites did not do enough to stop the video spreading. Social media users asked people to stop sharing it. One said: "That is what the terrorist wanted." Another said sites quickly take down music videos but not terror videos.
Facebook said it quickly removed the video after the police told them about it. Facebook also removed the shooter's Facebook and Instagram accounts. YouTube said it removes videos after people tell them. The UK's Home Secretary said sites must do more to stop the spread of "sick material". He said: "It is wrong and it is illegal." He said social media sites must not "do the terrorists' work for them". He said the terrorist wanted to spread his ideas.
Back to the Christchurch lesson.