jquail - 3:04 am on Jan 13, 2014 (gmt 0)
Looks like Panda to me.
Have done a lot of work on several sites and my Penguin impacted site hasn't moved at all.
My Panda impacted site (removed a lot of bad pages and rewrote/improved all the *imo* good ones) has improved a lot! Hopefully will show that hard work on the sites does pay!