Hi, I am experiencing in the Google SERPs some results (websites) with the caption "John shared this" or "You shared this" and if I check in "John" or "You" it takes me to Google Profile where I can see the shared link there. If I am not logged into my Google Account, I don't see that result with the caption. So, there is no doubt that Google is integrating Google SERPs with Google Profile, but I don't know how much this affect to SEO (I think a lot) but I want to read more about this. Does anyone have more details about this feature in Google SERPs ? Thanks!
I believe you are referring to Google personalized results. Below is a link to more information about it. http://www.google.com/support/accounts/bin/answer.py?answer=54041