The next time you’re trying to remember that bed and breakfast your buddy was raving about, or find a great charity to support, a +1 could help you out. Just make sure you're signed in to your Google Account.
The +1 button is a shorthand for "this is pretty cool" or "you should check this out." Click +1 to publicly give something your stamp of approval. Your +1's can help friends, contacts and others find the best stuff when they search.
+1 buttons will be available soon for the WebPages or Blogs, Add +1 to your pages to help your site stand out. You can fill out the details to get notified about Google like button here.
Learn more here