Hit by EMD Update? 6 Things You need to Do Right Away
There was a minor weather report indicating how Google penalized so-called low-quality EMDs. Matt Cutts indicated this in a tweet that was sent on 28 September 2012. He said it was a minor update and would affect just about 0.6% of English-US search queries and it was not related to Penguin/Panda in any way.
Though the update was supposed to be minor (as suggested by Matt Cutts) but it turned out to be quite a massive update concerning affiliate sites and for most webmasters who relied on their domain power to rank....