Digmen1 - 7:04 pm on Jul 2, 2009 (gmt 0)

Yes, I too use Facebook, and I find like you that over half of my Facebook visitors come from those apps.
But I have not done any statistics on their activity.
Sorry I cannot help much.
But I do find that the cost per click on Facebook is getting far too high for us as we have a low price product.
Like all big companies they are hard to get response from.