It’s 8:30 am. You’re on the subway. It’s crowded; you see an ad for a new flat-screen at Best Buy on the wall. And it’s on sale? Well, what’s stopping you? All you need to do is enter the URL on your phone and get the coupon. But that means folding your newspaper, finding a place to store your coffee and keeping your balance while trying to type the URL into your phone.
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