CHICAGO ( TheStreet) -- Think of it as the 21st century version of clipping coupons. Groupon, a website that sets up discount shopping deals, has boomed in these penny-pinching times. In only two years, it has expanded to 90 U.S. cities and gathered 13 million subscribers.For the most part, Groupon's deals feature small businesses, from restaurants and spas to specialty stores and dance schools. There's no question it's a hit with customers, who get to try out a product or service for half or more off the regular price. Because a deal can be activated only if a certain number of people sign up, shoppers are encouraged to forward the offer to friends and family -- increasing Groupon's reach.
Done Wrong, Groupon Can Cost Business Big
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