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Some colleges and police departments are starting to use software that scans social media to identify local threats, but most tips still come from members of the public. Ikon Images/Getty Images hide caption

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Ikon Images/Getty Images

Awash In Social Media, Cops Still Need The Public To Detect Threats

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New Orleans police officer Patrick Schneider patrols Bourbon Street in the heart of the French Quarter on Saturday. Jason Saul/WWNO hide caption

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Jason Saul/WWNO

French Quarter Sees Violent Crime Surge; Residents Demand Changes

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Theodore Wafer (center) and his attorney Mack Carpenter sit in the back of the courtroom Jan. 15 before his arraignment in Detroit in the shooting death of Renisha McBride. Rebecca Cook/Reuters/Landov hide caption

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Rebecca Cook/Reuters/Landov

Los Angeles police officers take a break during a basketball game with residents of the Nickerson Gardens housing project in July 2011. Violent crime at Nickerson Gardens and two nearby housing projects has fallen by almost half since 2010. Thomas Watkins/AP hide caption

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Thomas Watkins/AP

After Years Of Violence, L.A.'s Watts Sees Crime Subside

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