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While Ning may not be a household name on the level of Facebook or Twitter, it's very likely you're a member of one of the millions of social networks created by users of the Ning platform. Ning has grown to more than 20 million visitors, according to comScore.
The announcement was made by Ning Co-Founder Marc Andreessen. You might remember him as the co-founder of Netscape, the web browser that was integral to the rise of the world wide web. He will remain as chairman of Ning.