sQusi is a free web service that stops behavioral marketing companies in real time from tracking you across the web and building profiles of your behavior through third and even sometimes first party tracking cookies, scripts and files. Some experts describe these files and devices as 'spyware' while others call them 'stalkware'. Either way, they are not 'good' for you because they do the same thing as adware and spyware applications. These devices are placed on your computer without your permission and data that rightfully 'belongs' to you is sold to others without your consent.

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