There are several levels of content personalization

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Reactive - this level is basic and contains the main attributes of the user: name or a short greeting when a certain process is completed;
proactive - consists of reactive level data and combines it with other data, such as the last visit date, or the latest records;
personalized — is the highest quality and at the same time the most labor-intensive level to implement. To implement it, it is necessary to use dynamic data that is based on user attributes or events. This level allows you to create individual content for each user.
Dynamic content is…
Dynamic content refers to any type of content US cell phone number list that changes as a result of certain user actions. All the hard work is done by the program, as the main campaign is created, and all the elements are pulled into it later.

Dynamic content can take different forms:

pictures or photos of items left in the shopping cart;
test message of the current problem;
personal data about potential clients, their location.
Dynamic content can significantly increase brand loyalty.

What problems may arise?
The main problem is a large list of target audience segments. A good example is applications for job seekers. This application is used by hundreds of thousands of people with different interests, specialties and areas.