"Conversations are becoming distributed and fragmented on the Web. Content is increasingly syndicated and re-aggregated beyond its original context. Technologies such as RSS, Atom, and PubSubHubbub allow for a real time flow of updates to readers, but this leads to a fragmentation of conversations. The comments, ratings, and annotations increasingly happen at the aggregator and are invisible to the original source.
The Salmon Protocol is an open, simple, standards-based solution that lets aggregators and sources unify the conversations. It focuses initially on public conversations around public content."