I have a network of 200 blogs (all separate domains, but the same IP), and all of them share the same Analytics code (account), and are in Google Webmaster tools under the same email. I heard they dont like it at all, and that it is even against their guidelines. What's wrong with networks to them, I dont know. It is like writing a series of books to me, but I heard that they automatically penalize.
I try to recover from a penalty like this, and I probably should:
1) discontiune using Google Analytics, and switch to let's say Piwik
2) delete Google Webmaster Tools accounts
3) spread the sites accross different IPs. How many? This sounds like a lot of headache, and does not make sense at all (to me)