diberry - 2:08 pm on Oct 7, 2013 (gmt 0)
My top site has never been hit by Penguin, but since the 4th I've seen a 34% increase in the amount of Google referrals. With the limited amount of keyword data I'm still getting from my stats program, it looks like I'm getting more long tail keyphrases and some keyphrases I've never seen before. I'm also noticing that suddenly Google's rejecting all my meta descriptions and picking their own snippets again... no idea why, and this could be a temp glitch.
As far as I've been able to tell, this site has never been penalized by anything. However, it's impossible to be sure - a modest drop of 10% or so could easily go unnoticed since search volume naturally fluctuates all the time with this site due to user behavior.