Dev/Grow

I had a blog post that got a HUGE increase in traffic, therefore I was watching very closely the number of shares on the Sharebar. Previously, this post was approaching 9k shares to Facebook, but about 2-3 weeks ago, it just dropped. I thought it was just a random fluke, but it never did correct. It dropped to approximately 6k shares to Facebook. I was considering changing to a different sharing plugin, but I really have liked this one, all except for this incidence. Do you have any idea what may have happened? And could it happen again?
The post is http://thestressedmom.com/2012/03/10-habits-for-a-well-run-home/
Thank you for your help!