My most popular ChicagoNow blog post by far was one I wrote a few months ago about Tumblr. Tumblr is one of those social sites that everyone talks about but significantly fewer people use. It’s a community for artists and photographers, really, and as such you can find on it some very creative work. This collection of must-see Tumblr pages includes crayon art, Google poetry, and a “pictorial love letter” to Chicago. Tumble away.