Google's John Mueller said in a video hangout from May 1st, that often when he looks into SEOs or publishers complaining about Google de-indexing issues, often the issue is with Google not finding enough quality on the pages it has deindexed. John said in these cases, Google no longer wants to index the pages because they do not meet the quality benchmark....
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Google Deindexing Your Site? It Might Be Related To Quality Issues.
seroundtable.com