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There's a lot more to YouTube and video marketing than most people realize. Text messaging, text email and text based websites will alway be around.
But the undeniable fact is that more and more people, espeically the busy, mobile, upscale and upwardly mobile people you probably want as your next clients......they're more likely to watch a video that read an email. Especially on a mobile phone.
The diagram to the right and the states that follow here(from something I'm reading right now) say it all.