TheOptimizationIdiot - 4:23 pm on May 4, 2013 (gmt 0)
I recently have done a test that would give some evidence that this is true.
That's really interesting, but Penguin hasn't run afaik which would mean something else is triggering the bouncing.
* It's not at all that I don't believe what you're saying or don't think you might be on to something. I haven't tested the nofollow linking like you did, but I have seen similar bouncing from different actions myself. I don't think we can attribute the bouncing / ranking signals you're noticing to Penguin though.