Get Reactions To Posts in Google Reader from FriendFeed, Twitter, Digg, Hacker News, Reddit and more with gReactions Firefox Extension

gReactions is a Firefox extension that allows you to read comments from all over the web to your posts, directly from Google Reader. For each post in your feed it gets comments from the blog and services like: FriendFeed, Twitter, Digg, Hacker News, Reddit and many more.

This is a very interesting addon which can be used to get feedback for your blog posts.