Could the riots that Barcelona experienced this Saturday happen again? While the circumstances of the call, which brought together hundreds of young people in the city center to loot dozens of shops, are still being investigated, alerts of new calls are arriving this weekend in the Catalan capital and other cities in the State. What is known, for the moment, is that social media has been the method to gather the young people, many of them minors, who took part in the disturbances. The operation is called Blocus, and it uses Instagram and TikTok, as well as WhatsApp and Telegram groups, to summon mass movements.