Check it Out: What the Experts Are Saying

"Despite Facebook's more than 400 million users, it's worth also looking at smaller and more targeted social networks. For example, Ning has millions of targeted social networks running its platform, and you can advertise on Ning via Google AdSense or AdBrite."

From "The Second Decade of E-Commerce: 5 Trends to Watch For," by Eyal Keren, vice president of marketing at onsite comparative pricing systems provider WinBuyer