The first to publish the information about the suicide bombings in Riyad a few hours ago, in the Islamist forums, was someone who is important in the al-Qaida propaganda apparatus. Posted at al Qaida-affiliated web forum sadaaljihad.net (hosted by Lycos Europe, registered to an individual in Jeddah, KSA) was the following:

click the image to enlarge.

The al Qaida operative uses the following Hotmail account:
khadija1417@hotmail.com

and maintains the following two sites:
http://www.geocities.com/khadija1417/
which points to
http://uddat.8k.com

At the second site, you can download this image, which contains an assortment of links to Jihad sites at Geocities

click to enlarge