Pete Meyers said it was a legit change and there was no bug with Mozcast:
I noticed lots of our pages dropped in ranking today.
I saw a massive spike from Googlebot in my log files. I thought it was a little odd.
I am seeing the same for both US ecomm sites I monitor--traffic is down 10-15% and has yet to bounce back since Tuesday
Most of the discussion though is around low conversions and this Google search snippet date bug.
Did you notice a Google update? Did your rankings or traffic change on Thursday? It seems small and not 100 degree weather from my opinion.
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