After a long day in which police went door to door searching homes for Dzhokar Tsarnaev, I listened to officials in the Boston area tell the public that they were opening the subway, roads and allowing people back out on the street. Minutes later I watched in horror as shots rang out in Watertown and the hunt for Dzhokar Tsarnaev continued. On my TV, I watched as helpless news anchors talked about what they knew, realizing that none of them had the power of Twitter at their disposal.