The brainchild of former Goldman Sachs investment banker Gina Bianchini and celebrity geek Marc Andreessen, Ning has been growing automagically from the moment it launched its Social Networks for Everything -- a free platform for do-it-yourself social networks -- in February of last year. By June, there were 60,000 Ning nets and by August, 80,000. At year's end, there were 150,000, and today, more than 230,000.
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