How does Google +1 decide your "friends"?
When you "like" on Facebook, it appears to your Facebook network. Same with sharing on Twitter.
But when I click "+1" on a search result or article, who sees this? Is it based on people I have emailed in the past using Gmail? Who are the "friends" that Google claims I am sharing with?
I have installed the +1 button on articles on my site, but unsure how effective it is yet in influencing searchers.
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