Secret, a new app that lets you post anonymously, removing the last bits of restraint preventing people from sharing whatever is left they're reluctant to share…seemed to me of dubious value. But then, I signed up. And discovered Secret's true (yet unmarketed) worth: as fodder for writers building fictional characters. "Brought a can of cat food to a dinner party instead of pate and no one noticed." And presto! A fully realized character leaps to your screen, one who'll move freely, creating scenes, engaging in dialogue. Cut. Paste.