Official Google Blog: The +1 button for websites: recommend content acro...: "Since we started rolling out the +1 button in March, you’ve been able to recommend content to your friends and contacts directly from Googl..."
"We hope you’ll agree that +1 buttons across the web make it even easier for you to recommend content to your friends and contacts, and make search results even more helpful and relevant."
It will also make it easier for Google to boost good sites that people like. Not so complicated Machine Learning Algorithms required.
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