Questions
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How does linkedin get grey microdata when searching a persons name?
I can't say for sure, but I would guess that Google is at this point familiar enough with LinkedIn to be able to pull information without much markup. Plus, there are even ways individuals can pull information from LinkedIn. Check out Rapportive for GMail; it's pretty useful! As Martijn said, it's also entirely possible that Google and LinkedIn work together in some capacity.
Intermediate & Advanced SEO | | MattRoney0