The website's "frequently bought together" feature directed customers to items that can be combined to produce crude explosives.
It took no time at all for the right to start spreading misinformation, using a tragedy for its own ends.
Abu Izzadeen may have a history of radical behavior, but it would have been hard for him to attack Parliament from his prison cell.
In the past, atrocities in the UK were followed by speechlessness. Now, everyone has a bit to say and a part to play.
Four people, including the attacker, have now been confirmed dead and 20 people have been injured.