Some of the tech companies that have gone public recently:
Demand Media Inc., online content publisher, Jan. 26, 2011
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
Jive Software Inc., creator of tools to run social networks for businesses, Dec. 13
Zynga Inc., developer of online games, Dec. 16
Coming Up:
Yelp Inc., online reviews site
Facebook Inc., social-networking service
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