The federal government's proposal to create an e-health number for every Australian has renewed debate over how our personal medical information is collected and distributed. But the global company Google also collects and controls massive amounts of personal information. Google has just launched its new social networking site - Buzz - for the more than 150 million people who use gmail, Google's email service. Some commentators are concerned it's another step towards an unhealthy level of surveillance and data collection. Social researcher Vivienne Waller raises these concerns, we also hear from David Vaile from the Australian Privacy Foundation.