simpson tweeted to r about the controversial event, when will they ever learn? that same jihaddy tweeted out about the event, referencing the charl charlie heb doe event. investigators now trying to determine if simpson was trying to get the jihadist attention or was actively plotting with them. a top fbi official saying the use of social media by terrorists is a daunting challenge. >> it allows like never before for overseas groups to reach into our communities to recruit, to radicalize, as well as to target our citizens. all in a very simple, easy to use way. >> back on april 10th, in a private twitter message intercepted by the u.s., cnn told simpson discussed with others how to get to syria. bring your passport. if you have $4,000, that's enough to travel with. hours before the attack, simpson urged his twitter followers to follow a known isis attacker. >> somebody known as a propagandai propagandaist, someone known for his hacking skills. >> tonights, we're learning more about the gunman's past. elton simpson was captain of his high school basketball team. his former lawyer notices how religious he seemed. >> he was a very d