Yesterday, June 30th, there may have been an unconfirmed update, just two days after Google ran the spam update - which ran on the 28th and would have then been seen more on June 29th than the 30th. But who knows, maybe it ran into the 29th and what we are seeing are fluctuations due to part two of the spam update?...
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June 30th Google Search Ranking Algorithm Update & Fluctuations
seroundtable.com