This is each of the big threes information gathering details from their privacy policys
Yahoos
Yahoo! automatically receives and records information from your computer and browser, including your IP address, Yahoo! cookie information, software and hardware attributes, and the page you request.
Yahoo! uses information for the following general purposes: to customize the advertising and content you see, fulfill your requests for products and services, improve our services, contact you, conduct research, and provide anonymous reporting for internal and external clients.
Googles
Information we collect and how we use it
We offer a number of services that do not require you to register for an account or provide any personal information to us, such as Google Search. In order to provide our full range of services, we may collect the following types of information:
Information you provide – When you sign up for a Google Account or other Google service or promotion that requires registration, we ask you for personal information (such as your name, email address and an account password). For certain services, such as our advertising programs, we also request credit card or other payment account information which we maintain in encrypted form on secure servers. We may combine the information you submit under your account with information from other Google services or third parties in order to provide you with a better experience and to improve the quality of our services. For certain services, we may give you the opportunity to opt out of combining such information.
Cookies – When you visit Google, we send one or more cookies – a small file containing a string of characters – to your computer or other device that uniquely identifies your browser. We use cookies to improve the quality of our service, including for storing user preferences, improving search results and ad selection, and tracking user trends, such as how people search. Google also uses cookies in its advertising services to help advertisers and publishers serve and manage ads across the web. We may set one or more cookies in your browser when you visit a website, including Google sites that use our advertising cookies, and view or click on an ad supported by Google’s advertising services.
Affiliated Google Services on other sites – We offer some of our services on or through other web sites. Personal information that you provide to those sites may be sent to Google in order to deliver the service. We process such information under this Privacy Policy. The affiliated sites through which our services are offered may have different privacy practices and we encourage you to read their privacy policies.
Gadgets – Google may make available third party applications through its services. The information collected by Google when you enable a gadget or other application is processed under this Privacy Policy. Information collected by the application or gadget provider is governed by their privacy policies.
Location data – Google offers location-enabled services, such as Google Maps for mobile. If you use those services, Google may receive information about your actual location (such as GPS signals sent by a mobile device) or information that can be used to approximate a location (such as a cell ID).
Links – Google may present links in a format that enables us to keep track of whether these links have been followed. We use this information to improve the quality of our search technology, customized content and advertising. Read more information about links and redirected URLs.
Other sites – This Privacy Policy applies to Google services only. We do not exercise control over the sites displayed as search results, sites that include Google applications, products or services, or links from within our various services. These other sites may place their own cookies or other files on your computer, collect data or solicit personal information from you.
Google only processes personal information for the purposes described in this Privacy Policy and/or the supplementary privacy notices for specific services. In addition to the above, such purposes include:
Providing our services, including the display of customized content and advertising;
Auditing, research and analysis in order to maintain, protect and improve our services;
Ensuring the technical functioning of our network;
Protecting the rights or property of Google or our users; and
Developing new services.
Bings
Uses of Information
Additional Details
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We use the information we collect to provide the services you request. Our services may include the display of personalized content and advertising.
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We use your information to inform you of other products or services offered by Microsoft and its affiliates, and to send you relevant survey invitations related to Microsoft services.
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We do not sell, rent, or lease our customer lists to third parties. In order to help provide our services, we occasionally provide information to other companies that work on our behalf.