Matt Cutts says in his blog:
“My [previous] post mentioned that ‘we’re evaluating multiple changes that should help drive spam levels even lower, including one change that primarily affects sites that copy others’ content and sites with low levels of original content.’ That change was approved at our weekly quality launch meeting last Thursday and launched earlier this week.”
This means that the duplicate content filters have been tightend and Google is using more sophisticated ways of identifying original content.
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