Introduction

Unless you’ve been living in a cave for the past few years, you’ve no doubt heard of YouTube, the video-sharing site owned by Google. YouTube lets anyone post videos online so that anyone else can watch. It’s a fun site and a popular one, constantly ranking in the top five of all sites on the Web with more than 130 million visitors per month. With hundreds of millions of videos on the YouTube site, it would take a viewer half a millennium to watch them all!

When I wrote the first edition of this book, back in 2008, YouTube was a lot smaller than it is today—still big, and still a major site, but less half the size. It’s more than doubled in visitors and videos in the two years since then, which is somewhat astounding. YouTube just ...

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