Social Networking Services Growing, Advertising Not So Much

The use of social networking sites will continue to grow, but advertising will not necessarily expand along with it, according to market research firm IDC.

Framingham, Mass.-based IDC says in a new study that social networks will face slow ad sales until they can get users to do more than just keep up with friends. That's because members of social networks such as Facebook, MySpace and Bebo tend to click on ads less than the U.S. Internet users overall.

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