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Brilliant, I was not aware of these facts.

More recently, Omar Hamoui was a solo founder of AdMob, which sold to Google for $750 million

Andrew Mason was a solo founder of Groupon, started with $1 million seed money from a former employer.

Do we all realize that Mark Z... is actually a single founder ?!

That's up for debate. Zuckerberg did early hacking on his own, but he started the company with Dustin Moskovitz, Eduardo Saverin, and Chris Hughes.