Microsoft appears to have stolen most of the product of a somewhat small microblogging or "micromessaging" startup called Plurk. I use Plurk: it's in a little widget in the sidebar. I also have it gated to Twitter. It's free. Microsoft wanted to start a competing service in China called "Juku," so they helped themselves to most of Plurk's work. Maybe that's how they think open source is supposed to work. :(
On the one hand, I guess M$ could solve all this by exercising more capitalism and buying up Plurk with their scads of cash. On the other hand, I don't know if I'd want that to happen. Plurk, for their part, does have their ownthoughts on the matter. But I bet this whole thing disappears pretty quickly, one way or the other. For Plurk, I hope that disappearance goes as well as it can for them.