Some of the tech companies that have gone public

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Some of the tech companies that have gone public this year:

Demand Media Inc., online content publisher, Jan. 26

Zipcar Inc., online car rental company, April 14

LinkedIn Corp., online professional network, May 19

Pandora Media Inc., Internet radio company, June 15

Zillow Inc., real estate website, July 20

Groupon Inc., online deals company, Nov. 4

Angie’s List Inc., consumer-reviews site, Nov. 17.