Google Penguin Update 2.0 Wreak Havoc!
As of May 22, 2o13, the said update is live according to Search Engine Watch. The Google Penguin Update 2.0 is said to dig deeper into your sites looking for possible links that are believed to be irrelevant, paid links embedded in post/s.
Some website/s and blog/s of mine with corresponding Google Pagerank scores dropped like a brick from Pagerank 3 down to 0.
Have you checked your sites?