teedubya 's Public Library

Advertising networks are popular right now - Glam recently raised $85 million after transitioning, seemingly overnight, from a small web property focused on women to selling advertising for a variety of similarly-focused publishers. And John Battelle’s FM Publishing, an advertising network focused on technology blogs, recently hired investment bank Savvian to help them raise money or sell after turning down a $100 million buyout offer.

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the number of Web sites that ads were placed on doubled to more than 1,800, according to the 2008 Digital Outlook Report.

"This endorses the strategy of the portals to buy ad networks"

Today, online publications and Internet companies have space for display ads built into their Web sites. Typically, that space gets filled with ads either the old-fashioned way -- through a salesperson -- or by a mix of computers and people called an ad network that automatically sells ads for the spot. But a significant portion of the available ad space -- called "inventory" -- remains unsold, or is sold for next to nothing. Enter the exchanges, which use automated systems to match buyers with sellers of unsold space.

Web sites rely on data such as IP addresses -- identifiers for PCs connected to the Web -- to know the general location, gender and other characteristics of the Web surfer pulling up an ad. Sites also use cookies, small files stored on users' computers, to track their Web activity, such as recent searches. Web publishers say the cookies generally don't allow them or advertisers to know the actual identity of specific users -- and any data are made anonymous. But for a car maker who might want ads to be shown only to consumers who had previously visited auto sites or had done car-related Web searches, for example, the targeting such technology makes possible can be attractive. By bringing together a lot of ad sellers, exchanges can potentially help advertisers buy a larger quantity of such specifically targeted ads across different Web sites.

The free, open source ad server trusted by more than 30,000 web publishers in over 100 countries around the world. OpenX is a powerful ad serving solution that puts control over online advertising back in the hands of publishers.