From Bloomberg | One of the challenges facing Chicago-based Groupon Inc., which offers a daily deal to consumers in more than 140 cities, is that the site’s coupon-wielding hordes can overwhelm small businesses, rankling partners and customers alike. Overcoming those glitches will be key to helping Groupon maintain growth, hang on to its $1.35 billion valuation and possibly move toward an initial public offering. The company is making an effort to ensure that business partners aren’t overrun with customers, said Chief Executive Officer Andrew Mason.

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