Automattic has added a new “Like” feature to its WordPress.com blog service, similar to Facebook.
The “Like” button placed at the bottom of the blog posts once clicked shows Gravatar images of all the bloggers who like a post.
“If you’re interested in keeping track of how many likes your own blog posts are receiving, there’s a new “like count” column on the “Posts > Edit Post” screen. This will show you the total like count on each of your posts, right next to the total comment count.
If you’d prefer not to display likes on any of your blog posts we’ve provided an option to turn them off under “Appearance > Extras.” You can still enable or disable likes selectively on individual posts through the “Show likes on this post” checkbox when editing or writing a new post.”
Blog host WordPress.com opened in November 2005. It uses WordPress, open source software, to publish content.
More Info: http://en.blog.wordpress.com/2010/08/03/like-a-post/