Group buying site Groupon is suing one of the many small startups trying to emulate its successful social shopping model over a patent that was originally filed over a decade ago. The target of the lawsuit is MobGob, which enables people to use their existing social networks to gather their purchasing powers and collectively buy goods or services from sellers online. The complaint is embedded below. Groupon alleges that MobGob infringes one of its patents by operating a system for aggregating demand for the purchase of a product by a number of individual buyers. 
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