The Swedish suicide bomber apparently frequented the jihadist corner of Facebook. I knew that this Facebook would become a force for evil.

Among the sites he was interested in on Facebook was Yawm al-Qiyaamah, which means Resurrection Day; The Day of Judgment.

The image used to illustrate the site, which has more than 8,000 followers, is an inferno engulfing Tower Bridge as a tidal wave swamps one side.

The first quote used by the group is: "This life is but a transitory to the Hereafter.

"So let us know what the Hereafter can do to us and what we can strive to reach it, Inshallah [God willing]."

It contains several postings, quoting from the Koran, with reference to non-believers warning of "an imminent punishment".

In another post, the Yawm al-Qiyaamah site describes the danger of the office Christmas party. "Do not make any second thought - avoid participating in their blasphemy such as Christmas party or New Year party, be it in words or in deeds." Abdulwahab also read postings by groups with Arabic titles, including "Mainstream Salafi Jihadi", which follows a Saudi Sunni doctrine.