From the website introduction:
Consider this: Sherlock Holmes dropping a quick note to Marie Antoinette. Or Spiderman asking a hobbit for career advice. Or your favorite teacher from high school gossiping with a Japanese samurai. Or some other unlikely pairing involved in some deep philosophical debate. Or develop your original fictional characters through stories and conversations.
Each member portrays one or more historical, fictional or original characters, through email posts to the group or through storytelling of the narrative kind. For writers this is a unique opportunity to explore characterization. For anyone creative this is an opportunity to have some bona fide fun!