Chad Hurley, Steve Chen and Jawed Karim came up with the idea for a video-sharing site after finding it hard to share video shot at a dinner party, and founded YouTube on Valentine's Day 2005. The original HQ was a small office in San Mateo, California conveniently situated above a pizzeria and a Japanese restaurant.

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Now take a look at some of America's oldest companies

In pictures: the humble origins of famous American companies