It seems like in any successful social network (and by successful, I mean "gains any reasonable multimillion person audience"), there's an arc. I saw it on MySpace, on Reddit, on Facebook, on G+. It happens over and over again. There are great organic conversations early on. Influencers arise and begin to create organic clusters. Marketers see the traction and step in, and begin commercializing conversations. The quality of the network goes downhill, and then it becomes a place you post to if you continue to pay attention to it in spite of the network as opposed to because of it.
I've followed you on Google, Facebook, and Twitter, and like Guy Kawasaki, you've always walked a fine line between fostering organic conversations and presenting marketing conversations. I know, I know, "Evangelism", but let's call it what it is.
I'm curious how Cake will solve THAT particular problem. I'm very much ready for a new network.