I started thinking about how thought streams may be shared, or collaborated on. Never got particularly far on the details and never got to implementing anything. I shared some of my thinking on twitter at the time and I think some people related it to Tumblr but it seemed (and still seems) different to me. Each new thought or musing would be the start of a new stream. It's almost like having a blog for every idea you have, or every concept you want to explore.