PopuList allows you to track the popularity of your posts on social bookmarking sites reddit, stumbleupon, del.icio.us and digg. When PopuList is activated, a page is added to your dashboard giving the number of times a page has been saved or upvoted.
New in version 1.5 PopuList now also lets you view backlinks as indexed by Google and Yahoo.
Te puedes descargar este plugin para utilizarlo en tu instalación autoalojada de WordPress.