It looks like some people using Google Notebook are bookmarking sensitive personal information, including social security numbers and email passwords. And others are finding that sensitive information via the Google Notebook search tool.

This all played out in the comments to this Digg post. What’s amazing is that Google Notebook defaults to privacy, and users have to explicitly opt in to have information made available via the search. Google probably has no responsibility for this information, although some of it appears to be third party personal information, and they are hosting it on their servers. We’ll see if they start to censor this stuff to avoid liability.

Our previous coverage of Google Notebook is here and here.

Update: Yep, it looks like Google is starting to take down some of the sensitive content linked from that Digg post: