Tech Darlings Defy the Market

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By John Tozzi

November 18, 2011 at 12:54 AM UTC

This article is for subscribers only.

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This article is part of the November 21, 2011 issue of businessweek.

Valuations of closely held tech darlings have risen far faster than the broader market, according to SharesPost, which acts as an intermediary between buyers and sellers of shares in companies such as Facebook, Zynga, and Twitter.