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Ning, the social-network software maker cofounded by Marc Andreessen, appears to get substantial traffic from adult-oriented websites it hosts. CPM Advisors notes that some of Ning's top networks include names like girlongirl.ning.com, whiteholes4blackpoles.ning.com, and ladyboyworld.ning.com. From Quantcast's and Alexa's numbers, these creatively named sites account for a double-digit percentage of Ning's traffic. Ning's terms of service do not forbid pornographic content, so no rules are being broken here, it seems. Still, one wonders if this is really what Andreessen, who previously cofounded Netscape and Opsware, had in mind for his third entrepreneurial act.