【SEO】マカビーアップデート(Google12月中旬の順位変動)
【SEO】12月中旬の順位変動（マカビーアップデート）にGoogleがコメント・ツールを確認
Various reports are out there that Google had an "update" to search last week. This is our statement that says nothing about a *single* update:
— Danny Sullivan (@dannysullivan) 2017年12月20日
"We released several minor improvements during this timeframe, part of our regular and routine efforts to improve relevancy." ...
