http://blog.louisgray.com/2009/10/proposed-salmon-protocol-aims-to-unify.html

<<As comments on the Web become fragmented, conversations that occur on downstream aggregation sites often are taking place in a silo, disjointed from parallel discussions on the originating Web site. Over the last two years, many people have found this evolution controversial, hoping to unify the conversations in a central location – and some services, including JS-Kit's Echo and Disqus, have taken the first step by pulling external discussions to the source. But a brand new proposal, authored by John Panzer of Blogger, called the Salmon Protocol, is looking to take advantage of Pubsubhubbub to unify the conversations in all places, both upstream and downstream. And yes... the name of Salmon comes because those fish manage to swim upstream, just like the comments.>>