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How seriously is the advertising world taking Facebook and MySpace? Yesterday, advertising behemoth WPP Group acquired interactive agency Blast Radius. Terms were not available, but Blast's revenue last year was about $43 million. The significance?

Blast is considered the go-to firm for advertising on social networks. One of its brands, Nike, is reported to have signed on as a "Landmark Partner" with Facebook as it launches a new ad product on November 6. All this follows WPP's $649 million acquisition of online-ad network " 24/7 Real Media in May. So sure, WPP may not be a brand name you people can relate to — maybe the conglomerate should try changing its name to WooPop! — but for your wallet's sake, please try to pay attention. (Photo by AP /Elaine Thompson)