How Facebook Build Shadow profile of Non Facebook user
Today's internet world is all about data and information. Data is money therefore internet companies doing illegal practice to gather more and more data of user. companies and Mobile application ask more more permission than it requires to use their services.
I have seen many app over Google play store which ask more permission than app requirement. For example Truecaller ask all permission to use the app, Practically it should only ask access of phone contact which require to function the App on Smart Phone.
If you are registered over any news website. most of all news website have Facebook share button so that user can share the new story. Even you are not on Facebook but still Facebook observe your activity and create you Shadow profile. when you join the Facebook in future, Facebook will have information about you, what you like and what you does not like and serve you Facebook ads according to your internet history.
I Thanks to Mozilla Firefox Enhance Tracking protection which stop the script of Facebook share button on any news website or any website that have Facebook share button so that Facebook can not create Shadow profile of a user who does not use Facebook. if you download new version of Mozilla Firefox you will get default tracking protection.
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