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We've patented the idea... of using the address book as a place to declare that you like a brand. By so doing, the brand has now got your permission to send you personal messages - it could be money off offers, coupons, promotions, just information, whatever is appropriate. -- Keith Teare
If you send out one coupon with a deadline of a week and another that must be used within the next month, you end up having more redemptions with the one week deadline. It's really amazing. With the month deadline you have four times as much time, but people tend to say they'll use it in a few weeks' time and then they don't do it. -- Sendhil Mullainathan

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