Facebook founder Mark Zuckerberg and the heads of LinkedIn and Dropbox sponsored a 24-hour "hackathon" designed to highlight the tech skills of 20 undocumented immigrants in an effort to draw attention to the need for comprehensive immigration reform. The participants -- who were all so-called "Dreamers" brought to the U.S. illegally as children -- were divided into two groups, with one group developing a mobile application designed to identify supporters of immigration reform by congressional district.

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