Google geeks and privacy advocates love Google’s “Transparency Report” (now in its 5th version). In the latest version, it is interesting to note an upward trend of requests Google defines as “troubling”.
An interesting new feature is the ability to see aggregated court orders and other requests worldwide. To add some meat to this discussion, consider the fact that from July to December 2011, governments requested information on 28 562 user accounts. This number includes requests for user information and takedown requests for blog posts and videos. Of the 6321 US Government requests, Google auctioned at least 90% of them.
Just remember that nothing you do online is private and you'll be fine.