Oh yeah? How about the fact that he drove a car, or ate meat or spoke english or traveled a lot?
The "online radicalization" thing is complete and total bullshit: it's an excuse to ramp up the totalitarian surveillance state in a more obvious way than the "war on terror" -now it's a war on people who read things on the internet. Magic internet forums might make me into a terrorist ... or a hacker; better put me in prison!