ummm, not many of the terrorists were "radicalized over the internet".  Second generation Brit, Salman Abedi, the Manchester bomber, was trained by his own father Ramadan Abedi.  So I don't believe that these nutbars are just happening upon a website that magically turns them into murderous dead eyed religious zealots.  There has to be a mommy or daddy dearest (ergo Boston bombers) stoking the home fires....