I would have to say, just under logic that it would have to be some pretty bad stuff. At the same time also, I am sure they probably found a connection between the sites in some way. Google must take into consideration that alot of people who are bloggers, are using a shared hosting service. If you are just some normal blogger, posting your love of paper airplanes, then how are you supposed to be aware of your bad neighborhood. That is given you signed up for one of the zillion normal hosting services, that are out there.... Food for thought, also I am sure they probably already know its linked, before you even started it, hell before you even thought it, hell before you were even born.
GOOGLE IS SKYNET!!