Influencer marketing platforms usually measure audience retention by evaluating specific metrics that reveal how the audience interacts with the influencer’s content over time. These metrics may include:

1. Repeat Engagement: This metric captures the number of times the same users interact with an influencer’s content. It goes beyond reach and measures the frequency of interactions.

2. Time Spent: This metric shows how much time users spend on the influencer’s content, which can indicate a deeper level of engagement and attention.

3. Conversion Rate Over Time: Platforms might track the conversion rate of users who move from engagement to actions, such as purchasing a promoted product. Tracking this information over time helps establish retention.

4. Comments and Discussions: Analyzing comments could show how many users are repeatedly engaging and interacting with posts.

5. Follower Growth & Churn Rate: Regular monitoring of follower count increase or decrease can be indicative of the audience’s continued interest in the influencer’s content.

Platforms like HypeAuditor and SocialBakers offer tools to track audience behavior and retention. For instance, Socialbakers provide comprehensive analytics about audience behavior, patterns, and preferences over time. HypeAuditor, on the other hand, has a specialized tool for audience quality analysis, which can help measure retention.

Flinque, too, offers powerful tools for measuring audience retention, with features that allow brands and influencers to monitor and evaluate the above-mentioned metrics. It’s important to note that all platforms have unique features and strengths, and the choice between them largely depends on specific needs and budgets of the brands, agencies, or influencers.

To sum up, measuring audience retention in influencer platforms is a complex task, but using a combination of detailed metrics, businesses can get a clearer glimpse of how their audience interacts with their content, helping them make informed decisions.