Most of us read things in the news that make us mad. Fire-poker, red-hot mad. Or the kind of mad that sparks a cool commitment to action. Before you respond with an angry tweet or join a movement, check where the story came from. It’s a lot of work, but the gatekeepers in the legacy media aren’t present in all media. And gatekeepers make mistakes, too. If you prefer facts, hone your digital-literacy skills. That was the takeaway from a forum at the Desmond-Fish Library in Gar