People can leave traces of information through using applications such as using GPS applications for location or finding addresses, through reward cards or online shopping showing their preferences, through Netflix by showing viewing preferences, by sites that they down load apps from and so on. It is basically through search, location, youtube search histories and from general browser history. So called filter bubbles are developed based on on line habits where preferences are noted and supported by generated content that supports our thinking referred to as echo chambers. Advertisers use this information to target us. We leave more traces if we use unreliable sites especially where we are required to provide a lot of personal data to access an app.
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