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<p><span style="font-family: Arial, sans-serif; font-size: 13px; color: #a0a0a0; line-height: 19px;"> </span></p><div style="text-shadow: #4c4c4c 0px 0px 1px; text-align: justify; padding: 0px; margin: 0px;">It started as a simple Twitter beef, 140-character spurts of anger by two young men who grew up together. But the tough talk exploded out of cyberspace and onto the streets of Harlem, where a college student was gunned down feet from Gov. Paterson’s home.<br style="text-shadow: #4c4c4c 0px 0px 1px;" /></div><div style="text-shadow: #4c4c4c 0px 0px 1px; text-align: justify; padding: 0px; margin: 0px;"><br style="text-shadow: #4c4c4c 0px 0px 1px;" /></div><div style="text-shadow: #4c4c4c 0px 0px 1px; text-align: justify; padding: 0px; margin: 0px;">Now tweets sent by victim Kwame Dancy, 22, and accused killer Jameg Blake, 22, could become key evidence in a murder trial, the Daily News has learned. Dancy’s mother, Madeline Smith, is appalled Internet chest-thumping could have led to blood spilled on the sidewalk.</div><p>&nbsp;</p>