Journalists increasingly rely on Twitter to get pictures and information in breaking news situations. For events like the Alberta floods, the torrential downpour yesterday in Toronto and tragedies like the train derailment in Lac-Mégantic, eyewitness photos and video are a growing source before news crews can get to the scene. The big challenge using material generated through social media is making sure it’s authentic. Craig Silverman is on faculty at the Poynter Institute and founder of Regret the Error, a blog that reports on media errors and trends on verification. He writes about research on an automated system to ferret out the fakes.