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Social media companies employ many "content moderators" who filter out harmful content, so we don't see images or footage of violence or other disturbing content. The documentary film "The Cleaners" looked at the problems faced by those outsourced to do this work in the Philippines. Read the article on the BBC News site here: https://www.bbc.com/japanese/video-45... Subscribe to the BBC YouTube channel here: http://goo.gl/tYDMwU Follow BBC News on Twitter in Japanese here: / bbcnewsjapan