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Honestly, we've seen such high flux in April -- including that week -- that it's really hard to pull anything useful apart. We have no confirmation of an algorithmic event (other than the usual "There are events every day" line). There was talk last week about "Project Owl" -- Google's multi-pronged attack on fake news, but it appears that only a part of that is algorithmic, and that part has been rolling out over the past couple of months. I don't think the flux from the week in question is related to Owl. Hopefully, someone in the community has some more insight on the vertical-specific data you're seeing.