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This week it was announced that London was getting a new team of specialist police officers to investigate online hate crimes, including abuse on Twitter and Facebook. But how widespread is the problem, and is getting law enforcement involved the best way to tackle it? In this week’s Newshour Extra, join Owen Bennett Jones and his guests as they discuss why the abuse happens, and whether there should be limits to free speech on social media. Image: Woman looking at phone Credit: Thinkstock