The Cosi restaurant chain is enticing mobile users to share its special offers with their friends, offering a chance to win a prize. The contest goes beyond the usual loyalty program that rewards purchases to incentivize spreading the word via social networks. "The campaign is designed to drive social sharing, and a significant portion of users who click on shared links from friends and family are coming from a mobile device," said Angela SanFilippo, chief marketing officer of PunchTab, which is powering the campaign.

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