Here is an incredible list of all the startups that have sprung from ex-Google employees.

1 Twitter

Evan Williams sold his company Blogger to Google in 2003. In 2004 he cofounded Odeo, a podcasting company, which later became Twitter, which is now valued at $4 billion by investors. Considering Google's many struggles with social, and it's reported interest in buying Twitter, this must be the toughest of all the post-Google startups to swallow for Google's execs.

2 Howcast

New York startup Howcast was started by two ex-Googlers, Jason Liebman and Daniel Blackman. Howcast, unlike many other startups on this list, wouldn't have fit at Google. It's a company that makes how-to videos.

3 Instagram

Instagram is getting popular fast, and its founder was once at Google. Kevin Systrom has an interesting resume. He started as an intern at Odeo, which went on to launch Twitter. He then worked at Google for three years, before launching his own company Brbn wich morphed into Instagram. Instagram is a fast growing photo sharing application.

4 ChaiLab

We warned you this was going to happen! Adsense exec Gokul Rajaram decided to do his own company, Chai Labs. We're not exactly sure what it was going to do, but after just a year or so Facebook decided to buy the company for around $10 million.

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The acquisition was mostly about getting Rajaram into the company, though, it seems.

5 yFrog

Image Shack is the parent company of popular twitter photo company yFrog. When we spoke with founder Jack Levin last yearthe company was serving hundreds of millions of pageviews and doing millions in revenue.

6 Dasient

Two of the three people that founded anti-malware startup Dasient were once at Google. Ironically enough, Dasient just picked up an investment from Google Ventures.

7 Factual

he story of Gil Elbaz is a good one for Google. Elbaz joined Google after it acquired his company Applied Semantics in 2003. (Applied Semantics was the basis for AdSense.) He stayed with Google for about 3.5 years, learning many things along the way. When he had an idea for another company, he chose not to pitch it as a project for Google. Instead, he struck out on his own. His new company, Factual, organizes data, which is something Google does as well. He says he'd never have thought to do it inside Google, because he wanted the freedom that came from working on his own.

8 Foursquare

Here's another tough one for Google management. Google acquired Dodgeball, a social startup based on telling your friends what you were up to, in 2005 for a small sum. It killed the service four years later. The founders of Dodgeball had already left the company, planning to relaunch it as Foursquare, a mobile application that does the same thing.

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Today Foursquare is valued at well over $100 million, and ex-Google employee, and Foursquare cofounder Dennis Crowley was called "The New King of social media," by Wired.

9 Aardvark

A few former Google employees decided to take a chance on making a social search startup. A user could ask a question, which Aardvark would then route to the user's friends looking for an answer. Once it was answered it came back to the user. Google must have thought it was an interesting idea because it bought the company for $50 million.

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