
When it comes to gmail, google analytics, and webmaster tools I am so paranoid about google tying multiple projects to any one account or ip that I keep every project separate with new accounts, emails, and ips.
And I don't use chrome to access any google service in fear that they might be able to see my chrome installation id tied to multiple gmail, webmaster tools and analytics accounts.
If a friend or client adds me to their analytics, I then create a new email address and login from a new ip.
Paranoid much?
