Spotback is a new tool that lets users rate and discover content on blogs and websites. With this free tool users can give you feedback very easily with one click only.
By rating a post, each user gets personal recommendations to other post in your site. Since users have a way to find more post that they like, they visit more pages and stay longer on your site.
Adding this tool is very simple - usually one line of code will do the trick. To learn more about the tool go to http://spotback.com/invite