News: Google +1 how it works

Recommendations when you want them.

Learn more about the +1 button 

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.

Want to put the +1 button on your own website? Get the code.

See +1's

Sometimes it’s easier to find exactly what you’re looking for when someone you know already found it. Get recommendations for the things that interest you, right when you want them, in your search results.
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.

Show +1's

In order to +1 things, you first need a public Google profile. This helps people see who recommended that tasty recipe or great campsite. When you create a profile, it's visible to anyone and connections with your email address can easily find it.
Your +1’s are stored in a new tab on your Google profile. You can show your +1’s tab to the world, or keep it private and just use it to personally manage the ever-expanding record of things you love around the web.

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Learn more about the +1 button and personalization on sites across the web.

The +1 button and the Google+ project are both about making it easier to connect with the people you trust online. For the +1 button, that means bringing advice from trusted friends and contacts right into Google search, letting the users who love your web content recommend it at the moment of decision.

But when you’re managing a website, it's usually not real until you can measure it. So we’re happy to say we’ve got one more announcement to make -- today we’re releasing reports that show you the value +1 buttons bring to your site.

First, +1 metrics in Google Webmaster Tools can show you how the +1 button affects the traffic coming to your pages:

• The Search Impact report gives you an idea of how +1‘s affect your organic search traffic. You can find out if your clickthrough rate changes when personalized recommendations help your content stand out. Do this by comparing clicks and impressions on search results with and without +1 annotations. We’ll only show statistics on clickthrough rate changes when you have enough impressions for a meaningful comparison.
• The Activity report shows you how many times your pages have been +1’d, from buttons both on your site and on other pages (such as Google search).
• Finally, the Audience report shows you aggregate geographic and demographic information about the Google users who’ve +1’d your pages. To protect privacy, we’ll only show audience information when a significant number of users have +1’d pages from your site.

more: http://analytics.blogspot.com/2011/06/1-reporting-in-google-webmaster-tools.html