Recently released documents show that before Samir Khan died in a September 2011 drone strike in Yemen, the FBI thought about using him as an informant.
A new batch of heavily redacted investigative files reveal that the FBI was concerned about the anti-American screeds Samir Khan posted to his blog.
Islamic extremists probably know how to work the web better than you do. But how has that changed in the wake of the revelations of NSA spying? We asked a few experts what the future holds for jihadists and the internet.