AP This combo of photos released by the FBI Friday April 19 shows what the FBI is calling suspects number 1, left, and suspect number 2, right, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. By Elizabeth Chuck, Staff Writer, NBC News As authorities closed in on the Boston Marathon bombing suspects -- one of whom was killed during a violent shootout in Boston's Watertown suburb early Friday -- Twitter and other social media outlets lit up with outtakes from police scanner reports, including a moment when eavesdropping tweeters heard the name of a missing Brown University student come over the airwaves in conjunction with the Monday attacks. "Police on scanner identify the names of #BostonMarathon suspects in gunfight, Suspect 1: Mike Mulugeta. Suspect 2: Sunil Tripathi," read the most retweeted of the tweets, from the hacker group Anonymous. The post was retweeted nearly 3200 times. But on Friday morni...