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01 / Groupon > > For integrating web and the real-world shopping experience, changing consumer behavior, democratizing small businesses, and spawning an entire new category. The fastest-growing company in Web history, Groupon's flash deal site marries cents-off coupons to a Friday-after-Thanksgiving shopping frenzy. The company broke into the black just seven months after inception; globally, more than 500 copycat sites have already sprung up.

1. In a surprise move, AT&T this weekend revealed it has made an offer to buy the USA branch of global telecoms operator T-Mobile for about $39 billion. It will create the largest cell phone network in the U.S., but the deal isn't closing for a year--during which time competitors regulators, lawmakers and the public will have a lot to say on the matter.