Demographics search tool

Quantcast has launched a service that claims to enable marketers to search for websites by readership demographic.

"If a marketer is targeting black female readers, over 40, with an income over $60,000, then Quantcast’s new service serves up a list of websites which attracts that audience, and also tells you whether or not the site accepts advertising," CMSWire reports.

Quantcast divides sites between those that measure raw metrics ("Quantified" publishers) and those that do not. In the latter case, Quantcast's figures come from the site's own reports of traffic and audience.

The service is complimentary to users.