According to Amit Agarwal, Google updated their privacy policy, adding the following bit:

"Also, in order to protect you from fraud, phishing, and other misconduct, we may collect information about your interaction with our services. Any such information we collect will only be used to detect and prevent fraud or other misconduct."
http://www.google.com/privacypolicy.html

>> http://www.labnol.org/internet/google-privacy-policy-updates/6847/