• Business Insider, Friday, September 24, 2010 11:40 AM

Over the past year, Zynga made the biggest leap on Business Insider's Digital 100 list of most valuable Web startups. Increasing its common stock value by $3.8 billion helped the social game maker move up from #12 to #2 on the list. Facebook topped our list again, with a valuation of $25 billion -- up remarkably from $6.5 billion last year. "Facebook continues to grow at a tremendous clip and now has more than 500 million users worldwide," notes Business Insider.

"The company will generate revenue of over $1 billion in 2010 and become cash flow positive." Also of note, profession networking site LinkedIn just made the Top 10 by doubling its value over the past year -- "perhaps reflecting the shift in job-hunting strategies with the rebounding economy." Another big gainer was Gilt Groupe, which added $380 million to its common stock value, and moved up from #32 to #21 on the list. Perhaps the biggest looser, meanwhile virtual world maker Linden Lab, while $700 million in common stock value, and fell from #21 to #88. Depreciating more than any other startup this past year was gambling site Betfair, which lost $2.2 billion in common stock value, followed by browser maker Mozilla Corp., which lost $1.2 billion.

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