Twitter to me feels like an open air merchant market in a public square (specifically, I imagine the Piazza San Marco in Venice). Facebook feels like an open house where you’ve put up pictures, made it homey, and friends stop by regularly to chat. LinkedIn reminds me of a giant Chamber of Commerce mixer. I find these mental visuals helpful when I’m trying to decide how best to position a message, post or strategy to fit each network. Do you anything similar? More…