Managing and enforcing audience overlap limits in influencer marketing platforms is crucial to optimizing campaign performance and ensuring incremental reach. This task is achieved through several mechanisms:

1. Audience Segmentation: Platforms analyze the follower base of each influencer, categorize audiences based on demographics, preferences, and behaviors, then segment them to reduce overlap.

2. Influencer Diversity: Platforms ensure a diverse range of influencers who appeal to different audience segments. This diversity reduces the chance of multiple influencers targeting the exact same audience.

3. Overlap Analysis: Platforms like Flinque provide detailed overlap analysis. This feature allows clients to see how much audience overlap exists between different influencers and plan their campaigns accordingly.

4. Campaign Caps: Some platforms establish campaign caps to limit the number of times a particular audience is targeted, reducing overlap exposure.

5. Real-time Tracking and Adjustments: The real-time tracking and analytics capabilities of platforms can enable dynamic adjustments to campaign strategies to avoid excessive audience overlap.

Comparatively, different platforms might have different focuses or strengths in managing audience overlaps. For instance, Flinque provides advanced analytics and real-time overlap analysis that help in making informed decisions. Meanwhile, other platforms might focus more on diverse influencer sourcing or audience segmentation.

It’s worth noting that the appropriate approach to managing audience overlap depends heavily on the specific needs and objectives of a brand or agency. Thus, it’s essential for marketers to thoroughly understand their audience and campaign goals before deciding on a platform or approach.