Google has an experimental feature called +1 that you can add to your search results. Once its configured, you’ll see an icon next to your search listings. If you click on the +1 icon your preferences are recorded and it’s quite possible that your friends or even the general public will know about it.
You can sign up for the experiment at Google.com/experimental.
Here’s more on Google +1 from Huffington Post
NetFamilyNews take on Google +1