With ADXL, you have a range of options for audience selection, including:

1. Select from Facebook Core Audiences: You can choose from a wide range of Facebook Core Audiences, which are based on criteria such as age, interests, geography, work employers, work positions, behaviors, and more. By selecting multiple audience options, the estimated audience size will increase, giving you more reach.
2. Narrow Audience: This option allows you to add multiple segments of the audience for precise targeting. You can add multiple criteria such as age, interests, geography, work employers, work positions, behaviors, and more to each tier to give yourself some flexibility. However, it's important not to make it too specific, which can lead to an audience that's too small to be effective. ADXL automatically tries to find people likely to get you the result you specified in ad set creation within the target audience.

Using these audience selection options, you can create highly targeted and effective ad campaigns on Facebook and Instagram, ensuring that your ads reach the right people at the right time.