The Digital 100: The World's Most Valuable Startups

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Welcome to the Digital 100: The World's Most Valuable Internet Startups!

In this year's list, we've looked at and evaluated more than 300 startups and ranked the top 100.

So what are the 100 most valuable digital startups in the world?

Facebook tops our list again, with a valuation of $80 billion, up radically from $25 billion last year and $6.5 billion the year prior. Facebook continues to grow at a tremendous clip and now has more than 750 million users worldwide. The company reportedly earned $500 million on $1.6 billion in revenue during the first half of 2011 and is on track to do more than $4 billion of revenue for the year.

Rounding out the top five: Zynga, the social game developer; Groupon, the daily deals site; Twitter, the massive microblogging network; and Dropbox, the file storing and sharing cloud company.

EXTRA: Check out our list of the 15 startups with valuations of $100 million+ that you'd hardly heard of last year.