“After the leak of information regarding PRISM, jihadists alerted fellow supporters about it and advised to continue using encryption programs and other means of security such as Tor to hide their IP address while accessing jihadi forums such as al-Fida’, Shumukh al-Islam, and Ansar al-Mujahideen”
Source:After NSA leaks Jihadists flock to federally funded Tor | Washington Free Beacon