Google announced it will be adding a new experimental social networking feature to its search engine pages; a +1 button that will let you share interesting webpages with contact persons in Gmail or other Google services. The feature will first be rolled out to Google.com, other countries may follow in the future.
Use +1 to give something your public stamp of approval, so friends, contacts, and others can find the best stuff when they search. Get recommendations for the things that interest you, right when you want them, in your search results.
To participate in this experiment:
Make sure you're signed into your Google Account (required)
Click 'Join this experiment'
Search for something you love on Google.com
> Click the new +1 button, and make your mark on the web
Your +1's are public. They can appear in Google search results, on ads, and sites across the web. You'll always be able to see your own +1's in a new tab on your Google Profile, and if you want, you can share this tab with the world.