About a dozen times per shopping trip, the device lets out a "Ka-ching" as an electronic coupon appears on the screen.
WSJ: Mobile Checkout Devices Let People Scan and They Shop
Each time you toggled to a new tab, the ads on the right-hand side refreshed meaning a new page view and ka-ching for Facebook.
FORBES: How Facebook Can Be a $100 Billion Business
Josh Beckett, Carl Crawford and Adrian Gonzalez, ka-ching.
CNN: 'L' is for losers in L.A. sports
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