I am not quite sure how Google function in terms of Ranking. My own surprise is that Google will tell me that my post is indexed in Google when you search for ranking, it will hardly come up in any Google page. I don't know what that actually mean.
Thanks for sharing Tony.

Google has said that this update was a “broad core algorithm update” and that it does these updates “several times per year.”

Google references its advice from the previous core updates, saying there’s “no ‘fix’ for pages that may perform less well, other than to remain focused on building great content.

Over time, it may be that your content may rise relative to other pages.” Google also said, “As with any update, some sites may note drops or gains. There’s nothing wrong with pages that may now perform less well. Instead, it’s that changes to our systems are benefiting pages that were previously under-rewarded.”

Courtesy - Search Engine Land

I haven't actually Noticed any difference on my blog but there was a massive Google algorithm about three weeks ago. Many members have reported a drop in rank

Bing and Yahoo have always given me better rankings, but Google is starting to come around!

Sometimes I do better with Google, and sometimes I rank better with Bing and Yahoo. Just depends on something. I have no idea what that something is, though. LOL