Talking to the Twitter trolls and those who study them

The debate over internet "trolls" - those who use their social media accounts to abuse others - erupted after feminist campaigner Caroline Criado-Perez was bombarded with abuse via Twitter after successfully campaigning to have author Jane Austen depicted on the new £10 note.

Newsnight's Paul Mason has been talking to the Twitter trolls, to people who have studied them, and to those trying to come up with a technical solution for dealing with them.

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