Still more than 40 of these groups operate and flourish on social media sites, communicating on Facebook, Twitter, WhatsApp and Telegram, according to a senior official with Pakistan's Federal Investigation Agency, or FIA, who is tasked with shutting down the sites. They use them to recruit, raise money and demand a rigid Islamic system. It is also where they incite the Sunni faithful against the country's minority Shiites and extoll jihad, or holy war, in India-ruled Kashmir and in Afghanistan.