That’s easy – they track you! To receive any application from Google, they make you register. This can come at an advantage. With your account, they can save your recent searches. In theory, they can outline a general image of your information. To list websites, they use “spiders” that constantly scour the Internet going through links on the web. If you have a website and look at your logs, you’ll all the search engines tracking the site.
source: leo.am
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