Google is always improving the way we search on the internet, and aims to providing the most relevant search results to its users, it's now gone even further by on the social scenario by adding the +1 to the search results, which will allow users to recommend their own search results direct on the listing page (SERP).
See screen shot below, here you can see the +1 icon next to the Title of the search results, by clicking on that icon, you will be able to recommend the result to Google.
If you cannot see the +1 button then visit Google Experimental, where you can select an option to force it to appear in your searches.
When you click +1 you publicly give something your stamp of approval or recommend it. Your +1's can help friends, contacts, and others on the web find the best stuff when they search.
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.