adder - 4:44 pm on Jul 21, 2013 (gmt 0)
Planet13, from what you said about scraped content, I suspect this might be some sort of Panda activity. Google stopped announcing Panda updates and said it would run as a hidden assassin alongside the main algo. But they surely must be tweaking the Panda "section" of the algo. So, it might as well be that the drop in your traffic was something to do with a Panda tweak.
(I should mention that about 20% of the top 100 keywords to our site have the word "meaning" or a synonym for meanin in them - is that bad?)
Do you think you might have over-optimised the pages that rank for, let's say "blue widgets meaning". Do you have the keyword "blue widgets meaning" in the url and the title and the H1 and stuffed within the content?
For branded keywords (that use the three words in our domain name) we were down over 52%
Right... can your domain name be described as EMD? i.e. your domain name is nicebluewidgets.com and you have anchor text "nice blue widgets" in your link profile? And can everyone understand that "nice blue widgets" is indeed your company name and not just some keyphrase or product name? The reason why I'm asking is that I've seen a lot of Penguinised sites lately and their branded terms are almost never affected. If a company "Widgetry Blues" is hit by Penguin, it is likely to retain the #1 position for the term "Widgetry Blues" and is even likely to display a full set of sitelinks.