Extremists are using a BBC theme tune to avoid security measures on social media and post clips of beheadings and suicide bombings.
Islamic State networks are deploying several tricks to evade the software that technology giants use to look for extremist content, including using odd punctuation in their posts and disguising graphic videos with initially neutral clips, including a remix of the BBC News signature tune.
Experts fear that such methods mean that members of terrorist groups are starting to reappear on platforms such as Facebook, after years of them being in effect stamped out.
Moustafa Ayad, deputy director of international technology, communications and education at the Institute for Strategic Dialogue (ISD), said: “There are micro Isis networks appearing with some frequency that are gaming
