Quick Pitch: GroupTabs members check in for group deals at bars and restaurants. Genius Idea: Group buying, deal-a-day sites and location-based services are two of the hottest trends on the block in 2010; they're both attracting major attention from investors and advertisers alike. While Groupon and its many clones and competitors -- even Yelp, OpenTable and Zagat want a piece of the action -- off
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