To create an audience for people who signed up for a business newsletter, which audience creation tool should be used?

Using a Custom Audience is the right choice for creating an audience for individuals who signed up for a business newsletter. This tool allows marketers to reach their existing customers by uploading a list of email addresses or contact information from their newsletter subscribers. Custom Audiences are specifically designed to help businesses reconnect with their audience based on their previous interactions or engagement, such as subscribing to a newsletter.

This approach is particularly effective because it enables targeted advertising efforts, ensuring that marketing messages are directed at individuals who have already shown an interest in the business's offerings. In this scenario, the audience created can be nurtured further with tailored content, promotions, or updates that resonate with their interests.

Other audience creation tools serve different purposes. Core Audiences target predefined demographics, interests, or behaviors without focusing on specific existing relationships. Lookalike Audiences are designed to find new users who resemble existing customers but do not apply directly to those who have already engaged by signing up for the newsletter. Saved Audiences, while useful for keeping a specific demographic target, do not leverage existing subscriber data in the same way that Custom Audiences do. Thus, the specificity and effectiveness of Custom Audiences make them the ideal choice for this scenario.