Calif. – Ning, a niche social
network creation platform, announced on Monday that co-founder and CEO Gina
Bianchini has stepped down to become an executive in residence at venture
capital firm Andreessen Horowitz. Fellow Ning co-founder Marc Andreessen made
the announcement on the company’s blog. Ning chief operating officer Jason
Rosenthal will become the company’s new CEO. Ning counts 45 million registered
users across its 2.3 million user-created social networks.