Chatterati is a browser plugin that enables its users to have a discussion on any webpage on the Internet.
The Chatterati icon sits on your browser address bar, and whenever you browse to a page that has an ongoing discussion, it quietly displays the number of comments that have been made. The user can then click on the icon to see and participate in the discussion.
If there is no ongoing discussion, the user can also just start one!
Chatterati employs a scoring scheme, where users with good feedback get to rate other's comments. This ensures that unnecessary noise like spam and off-topic comments get voted down and are not displayed, and users get to participate in a high-quality discussion.
You can download the extension from https://chrome.google.com/webstore/detail/gcofjgcjnfblnifodeniggbibpidbhcg/details