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I wonder if those figures are massaged, considering everything else going on!

Amazon has observed exactly the same behavior. The average review for something on the internet is 4.5 stars.

What about astroturfing by product vendors?

That graph has been on the page since before any class action lawsuits were filed.

But that does not necessarily mean it is legit. Until the class action did we not think Yelp was totally legit?