Cerkl recommends using our Segments feature for different demographic information about your audience (i.e. location, age, gender, occupation).
You can add segments under Audience Manager > Segments. Type in the name of the segment and click the "Create" button.
You can learn more about how to upload subscribers to a segment here.
If you use this feature, you can narrow the audience for your content based on segment in Content Manager.
This is wonderful to use if you are planning an event in a certain city. You wouldn't want your Boston subscribers to have to worry about logging on to your mandatory webinar in Charlotte!