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Seems webmasters here, instead of crawling under a rock should come out and continue to share their insights in response to this so perhaps we can draw some real conclusions and take appropriate action.
On Sunday, all of my sites (they are connected to one Google authorship acct) were nuked, dropping from 1-5 in SE rankings to 10-15.
I don't know what happened. Some kind of manual review.
Let me guess: even if you "prove" yourself, your sites will never rank well again.