The beauty of +1’s is their relevance—you get the right recommendations (because they come from people who matter to you), at the right time (when you are actually looking for information about that topic) and in the right format (your search results).
Checkout the Video:
How to Get/Enable Google +1 in Search
Google Search will now incorporate recommendations from all sites you’re connected to, you can edit those under “Social Circle and Content” section of the Google Dashboard.
Google PlusOne +1 is rolled out to US then other countries, if you cant wait goto experimental search site and then visit google.com/ncr . Initially, +1’s will appear alongside search results and ads, but in the weeks ahead they’ll appear in many more places (including other Google products and sites across the web).
Enjoy the new Social search experience as Social recommendations start appearing over time.