Robert_Charlton - 5:57 pm on May 16, 2013 (gmt 0)
This was done last night but as of this morning each KW has dropped around 10-30 places from where it was.
Considering the time frame, this drop does sound coincidental.
That said (if there is cause and effect here), instead of looking at what you removed, perhaps you should be looking at what you added.
...and instead have a feed that shows the latest blog posts on our site instead of the twitter posts.
Some thoughts off the top of my head....
Are you adding a bunch of extra text content to your footers? Are you duplicating material that's elsewhere on your site? Making your page template overly "heavy"?
Adding multiple links in the footer section might either defocus your site or make it appear to be overoptimized. How many (links to) posts are you adding?
Also... is your site marginal in any other way? If there's an aspect of your site that's on the edge, changes might prompt Google to take an additional look, which might put you into a testing queue.