Criticism on Google Privacy – Data leaks, Cookies and Tracking
Data leaks
On March 10, 2009, Google reported, for example, that a bug in Google Docs had allowed unintended access to some private documents. It was believed that 0.05% of all documents stored via the service were affected by the bug. Google claims the bug has now been fixed.
Cookies
Google, like most search engines, places a cookie, which can be used to track a person's search history, on each registered user's computer. Google uses the cookies to maintain user preferences between sessions and offer other search features. Originally the cookie did not expire until 2038, although it could be manually deleted by the user or refused by setting a browser preference. As of 2007, Google's cookie expired in two years, but renewed itself whenever a Google service is used. And more recently Google anonymizes its IP data after nine months and its cookies after 18 months.
The non-profit group Public Information Research launched Google Watch, a website advertised as "a look at Google's monopoly, algorithms, and privacy issues." The site raised questions relating to Google's storage of cookies, which in 2007 had a life span of more than 32 years and incorporated a unique ID that enabled creation of a user data log. Google has also faced criticism with its release of Google Buzz, Google's version of social networking, where Gmail users had their contact lists automatically made public unless they opted out.
Google shares this information with law enforcement and other government agencies upon receiving a properly authorized request.
Tracking
Google is suspected of collecting and aggregating data about Internet users through the various tools it provides to developers, such as Google Analytics, Google Fonts, and Google APIs. This could enable Google to determine a user's route through the Internet by tracking the IP address being used through successive sites (cross-domain web tracking). Linked to other information made available through Google APIs, which are widely used, Google might be able to provide a quite complete web user profile linked to an IP address or user. This kind of data is invaluable for marketing agencies, and for Google itself to increase the efficiency of its own marketing and advertising activities.
Google is encouraging developers to use their tools and to communicate end-user IP addresses to Google: "Developers are also encouraged to make use of the userip parameter to supply the IP address of the end-user on whose behalf you are making the API request. Doing so will help distinguish this legitimate server-side traffic from traffic which doesn't come from an end-user."
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