Proprietary software like Windows often includes surveillance code to track user behavior and send this information to vendor servers. Linux has traditionally been immune to such privacy violation. Ubuntu 12.10 now includes code that, by default, collects data on Dash searches. The code integrates Amazon products into search results and can even integrate with Facebook, Twitter, BBC and others as per Ubuntu’s Third Party Privacy Policies. This article at the EFF tells how it all works and how to opt out of information sharing, while Richard Stallman himself comments here.