Google +1
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+1 is how you signal your appreciation for anything that grabs your attention on Google+ or on your favorite websites. When you read a post that makes you want to cheer, +1 is your applause; when you watch a video that has you in stitches, +1 is your laughter; when you see a photo that perfectly captures that special moment, +1 is your 5-star review.
Link for More Info
http://www.google.com/+/learnmore/+1/
Privacy Policy
https://support.google.com/plus/answer/1319578?hl=en
