I've noticed that when logged into Google, content shared by people within my social graph is being identified by a "(name of person) shared this". And, content shared by people not within my social graph (but people who have a Google+ account) is being identified with their picture.
My questions are:
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Is this "(name of person) shared this" content showing on first page of results because they're in my social graph. Or would this content have been on 1st page regardless of whether it had been shared?
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Why is google identifying who is sharing content when they're not in my social graph?
Thank you!