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Now compare the way these two ideas—HDTV and YouTube—changed the basic rules of engagement for their respective platforms. Going from analog television to HDTV is a change in degree, not in kind: there are more pixels; the sound is more immersive; the colors are sharper. But consumers watch HDTV the exact same way they watched old-fashioned analog TV. They choose a channel, and sit back and watch. YouTube, on the other hand, radically altered the basic rules of the medium. For starters, it made watching video on the Web a mass phenomenon. But with YouTube you weren’t limited to sitting and watching a show, television-style; you could also upload your own clips, recommend or rate other clips, get into a conversation about them.
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