10 Y Combinator startups that didn't make it, but should've

Y Combinator has invested in hundreds and hundreds of companies, and many of them have become quite successful. Reddit, Dropbox, Airbnb, Wufoo, Hipmunk, Loopt, Posterous, Heroku, and Scribd are just a few of the companies that are doing well today. But there are, naturally, many startups who don't make it.

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