guggi2000 - 12:56 pm on May 9, 2013 (gmt 0)
I checked the average position of the keyword queries in Google Analytics on all sites.
4-keyword queries are extremely fluctuating and much lower in the SERPs, starting March 30. One and two keyword queries are ranking a little bit better.
Our site - as many others in this thread - was hit on April 15 though. Still trying to figure out why. I will be sharing my stats.