Former MI6 director Richard Barrett used an appearance at the London First Global Resilience Conference to highlight the propaganda potential terrorists now have, thanks to social media. He declared tools such as Twitter the biggest cyber threat to the UK.
While the police and security services are still trying to defend against cyber attacks aimed at critical infrastructure, Barrett highlighted the ability of extremists to use social media to incite violence.
He gave the example of Mehdi Masroor Biswas, who he said was "believed to have been behind the pro-Islamic State (IS) Twitter account @ShamiWitness."
Prior to being arrested in India in 2014, Biswas was thought to have posted 140,000 posts to Twitter, where he encouraged his large follower base towards violence. The account had around 18,000 followers when it was shut down.