Treechat doesn't have an algorithm because it is early days…

Treechat doesn't have an algorithm because it is early days and there is not enough activity to warrant it. If treechat succeeds, the stream will move too rapidly for individual users to follow. Algorithms and other methods of advanced filtering will eventually be needed. But we won't be at the mercy of a single arbiter, the tech is open to the possibility of many competing front ends.