Google +1 is another attempt to make Google more social. It's Google's version of the Facebook "likes", a simple feature that's very powerful because it's part of a social network.Google will show +1 buttons next to all search results and ads, while encouraging other sites to include the buttons. All +1's are public and they're tied to Google Profiles. The goal is to use this data to personalize search results and ads by recommending sites +1'd by your friends. Google Social Search already does this, but there's no support for Facebook likes, so Google had to come up with a substitute.
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"+1 is the digital shorthand for 'this is pretty cool.' 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,
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.