Just few days back got this mail from Google Adsense . Just wana share with you the new feature of google adsense .

Hello,

In the next month, we'll introduce the +1 button and personal recommendations to display ads. The +1 button will begin to appear on AdSense for Content and AdSense for Mobile Content display ad formats -- image, animated gif, and Flash. +1s will be one additional signal to help determine an ad's relevance and we'll continue to show the ads that will generate the most revenue for you.

We previously launched the +1 button on Google ... Read more »