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It's the ad served while you are reading the news in the morning on an e-reader that knows you're at home and three blocks from a Starbucks. It's a loyalty program on your phone that, through a hotel-room sensor, sets the lights and thermostat and turns the TV to CNN when you walk in the door. It's finding a restaurant in a strange city on a Tuesday night, discovering that a store nearby stocks the TV you're looking for, or that a certain grocery on the way home has the cut of meat you need.
Forget Foursquare or Gowalla: Soon every website and service will be able to tell where you are, opening up the floodgates for location-based marketing and blurring the budget lines for advertisers.
Just because all of these companies want it and hype it doesn't mean the consumers want it.
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