Starting today you’ll notice a new feature at the bottom of all WordPress.com blog posts. We’ve enabled a “Like” button, which, when clicked, shows a Gravatar image for all the bloggers who like a post.

When you “like” a post two core things happen. First, the blog post’s author sees your “like” and can click-through to your Gravatar profile. Second, clicking “like” saves the post in your homepage dashboard (in the “Posts I Like” section), so you can share it with others, or just keep it around for future reference. 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.

We’re hoping this will be an awesome new way to discover other interesting bloggers, and start new conversations with people who — literally! — like you. If you haven’t updated your Gravatar profile yet, now would be a great time to upload a picture, a link to your blog, and any other details. Editing your profile is easy, just remember that all of your profile information is public.

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.

To help you get fully up to speed, check out the new support document on the likes system.

Update:
To turn off the Like button you will now need to go into Settings > Sharing. You can read more about this move here.