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So why did Google ever give rich snippets to low quality sites in the first place?
At PubCon 2013 Matt Cutts made a couple of statements that indicated they would be dialing back the number of sites for which rich snippets would display.
With schema do you need to include authorship on products?
Rich Snippets The ability to have and use rich snippets may be taken away for low quality sites in the coming months.
Authorship then becomes about Google's ability to extract entities from documents, matching those entities to a corpus that contains descriptors of that entity (i.e. – social profiles, official page(s), subjects) and then measuring the activity around that entity...
Specifically looking for information on how they deem particular markup to be of low quality as the Google blog states ...
I can see a blog getting a leg up with fresh content, but when all else is equal between sites that aren't blogs (and are updating content along the same time frames), I'm having a hard time making the distinction between what is high and low quality.