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Best Coupons:  Groupon taps into the energy of online social networking, but combines it with something grandma would understand -- saving money with coupons. The company has seen astounding growth in the past year-and-a-half, beginning in its home base of Chicago, then spreading to 65 cities across America -- including Pittsburgh in January -- and 80 cities across Europe. The company's founder and CEO, Andrew Mason, 29, grew up in Mt. Lebanon, before moving to Chicago for college. He explains Groupon as a "a local shopping site," tailored specifically to each city in which it operates. "Every day, we ...