Interesting im always wondering whats is next in terms of ranking. This one has been around but you believe they will add more weight to it ? Could be.. I though Social signals where going to get the boost from google as i have read that facebook ( With all its fake accounts ) now actually have a "page rank" for accounts to give them validity and influence on ranking activities such as perhaps reviews.
YouTube is owned by google so you know that that will influence rankings more than anything else.
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