diberry - 10:31 pm on May 6, 2013 (gmt 0)
Either that or the economy is collapsing.
Let's not even joke about that. For the first time in my lifetime, that doesn't sound ridiculous. :|
That said, from what you and others have posted in here, it does sound like Google made some kind of changes around that time. I'm not seeing any sign of it on any of my sites (informational, various niches), though, so it may be specific to a vertical or certain queries... or certain sites.
Wait, I take that back. My Penguinized site made a tiny bit of recovery just after the 15th. Do you think a Penguin update has already rolled out?