Description:Perhaps it was the take down of 49 gang members who were tweeting their illegal activities. Or maybe it was the arrest of the Brower gang which broadcast on Facebook when it was going out to commit a crime.
Since the beginning of this year, there have been several cases in which NYPD officers zeroed in on social media to build major cases against violent gangs, and on Tuesday Police Commissioner Raymond Kelly announced he would double the size of the anti-gang squad.(1:32)