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Netscape co-founder Marc Andreessen’s venture capital firm, Andreessen Horowitz, has invested in Twitter, Groupon, Zynga and Facebook.

As an individual, Andreessen was also an early investor in LinkedIn and is among the more than 102 million people who have posted their resumes and profiles on its website, a buttoned-down version of Facebook’s online playground.

It may be as much fun as playing games, chatting and posting pictures on Facebook, but LinkedIn has steadily grown since it started in 2003 and it’s now adding about a million accounts a week.

In a key distinction from the dot-com days, it also makes money _ $3.4 million last year on revenue of $243 million. Its revenue more than doubled during the first three months of this year, putting it on pace to bring in about $500 million in 2011 from advertising and fees.

Kertzman, managing director of Hummer Winblad Venture Partners, was CEO of Liberate Technologies, a maker of software for TV set-top boxes, during the height of the dot-com boom. In 2000, its market value soared to $12 billion.

“I knew something was wrong because I knew we weren’t worth that much and it scared the hell out of me,” Kertzman said.

Aaron Levie, CEO of an Internet storage service called Box.net, sees things differently. Levie, who is 26 and was in high school during the dot-com boom, thinks it’s a good sign that LinkedIn, Facebook and other companies are taking their time to build companies that make money before going public.

“You can tell this is a very different period than the late `90s,” Levie said. “Silicon Valley is definitely back, and much healthier.”

LinkedIn’s CEO, Jeff Weiner, said he doesn’t plan to dwell on high investor expectations.

“It’s exciting, but it’s a point in time,” Weiner said a few hours after he rang the opening bell at the stock exchange, where LinkedIn’s shares traded under the symbol LNKD. “One day’s trading is not going to be too meaningful, and the same holds true for the next few days and the next few months. I know it sounds a little like a cliche, but we are in this for the long haul.”

Weiner, a 41-year-old former Yahoo executive who became head of LinkedIn two years ago, still took some time to celebrate the IPO in a meeting that was beamed to all of LinkedIn’s roughly 1,300 employees from the company’s offices in the Empire State Building.

Many of LinkedIn’s employees are now millionaires, at least on paper. The richest is co-founder and executive chairman Reid Hoffman. Already considered one of the smartest and best-connected people in Silicon Valley, Hoffman joined the ranks of the world’s billionaires Thursday. Hoffman, 43, owns a 20 percent stake in LinkedIn, good for about $1.8 billion.

That value could wildly fluctuate, based on how other hot technology IPOs have performed through the years.

Until LinkedIn came along, software maker VMware Inc. had boasted Silicon Valley’s biggest one-day gain among IPOs completed during the decade after the dot-com bubble burst. VMware stock rose 76 percent on the first day of trading in August 2007. Thirteen months later, it had fallen below its IPO price of $29.

VMware’s experience also serves as a reminder that what goes up and comes down can go up again. The company’s stock closed Thursday at $93.89.

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