I love the Flusquare application becuase it is such a compelling mashup that delivers real meaningful data in a fun and interesting way. Leveraging your personal movements and the fact that you have flu-like-sypmtoms Flusquare is a reat overlay on an already popular program. Moreover the app give healthy people insights into where there are flu outbreaks and hotspots based on the check-ins of other people.
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The next question is who is going to buy and monetize this? I have a number of people and companies in mind that would love to send targeted coupons to folks who have flu-like-symptoms to drive sales. You can bet hey already have gotten an e-mail from me about this!