outland88 - 3:06 am on Aug 27, 2011 (gmt 0)
Google may indeed be targeting just what you say. In retrospect in the past many of what might be called MFA farms did operate multiple interlinking sites that boosted their own rankings. Most eventually seemed to be penalized by Google and vanished in my areas. The only tracing needed is through the Adsense account. Maybe Google is applying Panda to that or some type of clean-up is going on. I would think it was done manually though.