Yesterday I reported at Search Engine Land that Panda 4.0 may have hurt press release sites
and showed SearchMetrics data for PRWeb, PR Newswire, BusinessWire and
PRLog all losing between 60% to 85% of their SEO visibility.
This drop seems to have come right after the Google Panda 4.0 update. The controversy around press release sites were mostly about links flowing
from those releases, not necessarily the issue with the duplicative
nature...