| http://www.w3.org/ns/prov#value | - The move came in the face of a challenge from a freshly launched Google+ social network, which has won legions of fans by allowing people to share content based on which ???circles??? friends fall into. ???We???re announcing a bunch of improvements that make it easier to share posts, photos, tags and other content with exactly the people you want,??? Facebook???s Chris Cox said in a blog post.
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