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It is debated who actually invented USBs flash drive, as several companies all over the world claim to have been the first, however, what is known is that it was patented by M-systems in late 2000. The primary use of USBs was for storage, and being able to be used in the USB port made it a go-to way to transfer storage.
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It's safe to say that this is an important invention of the 2000s, if just because of its popularity. Invented by Mark Zuckerberg and other Harvard students, Facebook is a social media app and one of the most used in the world.
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Invented by Steve Chen, Chad Hurley, and Jawed Karim, youtube is another one of the most used apps, though this app is a video streaming site allowing people to create and watch videos.
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As the winner of the big console wars of the mid-2000s, it should be mentioned as a significant invention. Developed by Nintendo, it become one of the most sold game consoles ever, and was successful in getting nongamers a system to use.
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Windows 7, which was developed by Microsoft is probably one of the most important windows systems developed. It is an operating system which was and still is used in a lot of computers. It is the defining modern windows operating system.