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Who's Doing It: Zeer.com, Most Grocery Stores
What's New: Grocery stores are building networks of followers on Twitter, Facebook, blogs, and other social media sites. Shoppers can join Zeer.com, an online social shopping site that lets users scan reviews on more than 110,000 products, join communities of customers with similar tastes, and create shopping lists with favorite items automatically added. Zeer has an application for iPhones, too.