Gun control advocates want to shut down the National Rifle Association's online video channel, NRA TV. A scholar looks at what its videos are actually about.
More and more, news items, adverts and posts by friends are blurred in Facebook's interface. This all merges into a single stream of information.
The way people use social media – and the algorithms inside those systems – increases passions, and drives people to polarizing extremes.
New research has tracked how quickly Twitter accounts linked to extremism are being suspended.
A man has been arrested after driving a van into worshippers near a mosque in north London.