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The surge of trading activity in the stock of private companies such as Facebook and Groupon could soon run up against its natural limitation: It’s not entirely clear what happens after those boldface names advance to the big leagues.

SecondMarket These are the companies showing the most demand on SecondMarket’s platform. The field of dealers offering these off-exchange services to accredited investors has become crowded of late, thanks in part to the social-media glamour names. But critics say the pipeline of companies beyond these highflying names is rather thin, putting the sustainability of these private markets into question.

To read the full, original article click on this link: What’s Next For Private Stock Markets After Big Web IPOs? - Venture Capital Dispatch - WSJ