How well-defined is your audience segment on Pinterest?

As an AI language model, I don't have access to specific audience segmentation data on Pinterest or any other platform. However, I can provide insights based on general knowledge up to my last update in January 2022.

Pinterest provides robust tools for advertisers to define and target specific audience segments based on various criteria, including demographics, interests, behaviors, and engagement with Pins. Here are some ways Pinterest allows advertisers to define their audience segments:

1. **Demographics**: Advertisers can target users based on demographics such as age, gender, location, language, and household income.

2. **Interests and Behaviors**: Pinterest allows advertisers to reach users based on their interests, hobbies, and behaviors demonstrated through their interactions on the platform. This includes Pins saved, boards created, and searches conducted.

3. **Keywords and Categories**: Advertisers can target users based on specific keywords related to their products or services, as well as Pinterest categories that align with their target audience's interests.

4. **Engagement and Retargeting**: Pinterest offers options for retargeting users who have interacted with your Pins or visited your website, allowing advertisers to re-engage users who have shown interest in their brand.

5. **Lookalike Audiences**: Advertisers can create lookalike audiences based on characteristics of their existing customer base or engaged audience, expanding reach to users with similar interests and behaviors.

6. **Customer Lists**: Advertisers can upload customer email lists to target specific segments of their customer base or create exclusion lists to refine targeting.

Overall, Pinterest provides advertisers with a variety of tools and options to define and reach their target audience segments effectively. By leveraging these targeting capabilities, advertisers can optimize their campaigns to reach users who are most likely to engage with their content and convert into customers. For the most current and detailed information, I recommend visiting Pinterest's advertising platform or consulting with a digital marketing expert specializing in Pinterest advertising.