Setting up some slapdash social networking system to integrate all of your Google activity? Not my cup of tea, but whatever. Introducing it unannounced? Bad idea. Having the system automatically trawl for every account you have ever sent mail to, and connect you randomly? Very bad idea. Making it an opt-out deal instead of opt-in? Very, very bad idea. Firing squad bad idea. Permanently disable all of your accounts and walk away from Google forever bad idea.
I appreciate the many free services from Google. But this crosses a line that should have been obvious, and that feels threatening. One more like this, and I shut it all down: Gmail, AdSense, Blogger, Picasa, GoogleDocs, and all of the myriad services I probably don't know I have been automatically subscribed to.
What's next, GoogleIdentityTheft? "We automatically share all of your bank and credit transactions with everyone you have ever e-mailed! If you don't want this service, you can always turn it off! Hurrah!" Please, Google, think it through. We like you, and don't want you to be evil.