In an attempt at clarity, Google has amended its terms of service to say that it analyzes private data, including emails, for purposes including the delivery of ads and customized search results. The changes to its terms of service, announced this week, come as Internet users continue to grapple with how and why companies handle their data. In one recent high-profile example, Microsoft faced a backlash following reports that it had actually read someone’s Hotmail emails, under a policy that has since been changed.