T witter is in “real and present danger” from extremism and hate – with the Dover bomber the latest to be linked to the platform, experts have warned. A man said to be a prolific user of the social media site attacked an immigration centre in Dover, Kent, with crude incendiary devices before he was found dead. The attack came days after billionaire Elon Musk took over the micro-blogging site and amid concern over cuts to the company’s content moderation team. On Saturday, counter-terrorism police confirmed 66-year-old Andrew Leak, from High Wycombe, had been motivated by extreme right-wing terrorist ideology....