Rise to the "Resilient Cities" challenge! Join us for #HackCitySF at #CodeforAmerica 9/20 - Learn more >> http://grn.bz/HackCity13
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#Entrepreneur? Request an invite to our #HackCitySF #DataJam, validate ideas + bring them to the hack Sept 20th! http://grn.bz/HackCity13
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Rise to the "Resilient Cities" challenge! Join #GreenBiz for #HackCitySF at #CodeforAmerica 9/20 - Learn more here: http://grn.bz/HackCity13
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