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Introduction
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Two people can use the same service and encounter very different information. They may follow different sources, use different languages, live in different places, or interact with different topics.
Personalization means adapting what is shown to information about a user or their context. It can make a service more useful, while also making one person's experience a poor guide to what everyone else sees.
The aim is to understand the limits of your information sample and make deliberate choices when you need a broader view.