Google +1

The +1 button is 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 on the web find the best stuff when they search.

Currently available for English searches on Google.com.

To recommend something, all you have to do is click +1 on a webpage or ad you find useful. These +1's will then start appearing in Google's search results," explains Google.