US trolls knock al-Qaeda off Twitter He later took to Twitter to sound mildly astonished by his success. Twitter responded by suspending the account of the hashtag's creator, @gdslooptadhi, who had noticed the campaign and criticised the "infidels" for ruining his initiative. But American users of the hashtag were estactic with the truimph of trolling. A separate article by Mr Berger has pointed out the dangers of extremists co-opting social media. He has pointed out that Twitter's automated suggestions infrastructure poses dangers as a recruiting tool for extremists. He noted that users who take interest in conflicts, such as the uprising in Syria, can generate suggestions to follow accounts used by proscribed terrorist groups to spread their messages and recruit followers. One trial run that he carried out saw Twitter recommend the account of Ansar al-Mujahideen, a jihadist propaganda platform. "In a moment, you've gone from a casual interest in Syrian jihad to following a major node in the online infrastructure of terrorism," he wrote. In other recent work by Mr Berger he covered official US attempts to set up social media campaigns to counter fundamentalists on the internet.