Click +1 next to the Google search result 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 +1 will only work on Google search results but Google is working on to implement the +1 button right across the web.
Know more about Google +1 here or,
Watch this short introduction…
Looks cool, except I don’t see it in my search results.
It is similar to Facebook’s like button. It will increase the visibility of webpages.