Marginize

Marginize is a browser plugin that augments every page on the web with a sidebar and enables users to see others’ comments.

Marginize augments every page on the web with an independent space owned by the visitors where they can meet each other and interact freely. Marginize pre-populates that space with existing Twitter content about each page, and allows visitors to 'check in' to the page and comment. The most active community member becomes the 'curator' for that site, and other recently active users are shown after they check in. Browser add-ons for Chrome and Firefox are available on www.marginize.com, and a bookmarklet can be used with other browsers.