* When you’re driving in public, other people can see your licence plate.
* When you’re walking public, other people can see your face.
* When you’re checking your mail, people can see where you live.
* When you introduce yourself to others at a party, they will learn your name.
* When you’re picking up your kids from school, people can see the approximate age of your kids and what school they go to.
* When you shop at a store, people can see your shopping habits and make inferences about your lifestyle.
* When you’re at work, people will know your profession and career skills.
* When you’re posting online, people can read about your hobbies and political views.
* When you login to a website, the server knows your IP address and user name.
* When you install an operating system, the vendor has full access to your PC.
In isolation, these pieces of data are sensitive personal information that comprise your identity, and they cannot be concealed in the respective context by virtue of the way they work. But it’s when there are connections formed between them that it becomes a problem. The more links there are, the clearer a picture can be drawn about who you are. That can be very dangerous in the wrong hands, and the thing about a public space like the internet is you can’t always control whose hands it’s in. So the best action is to practice good privacy and limit the amount of information that’s disclosed, and particular compartmentalising them to limit the connections that can be made. Which includes things like not using your real name, face, or other identifying information like your address or licence plate online.
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