Influencer marketing platforms use a variety of methods to track re-engagement performance metrics. Re-engagement metrics reflect the continuous, repeat interaction of an individual with a brand after an initial contact. These metrics are pivotal for any brand since they help in reducing acquisition cost and increase customer lifetime value.

1. In-platform analytics: Influencer platforms, like Flinque and others, offer in-built analytics to track the level of audience engagement with branded content posted by influencers. They measure likes, comments, shares, and other interactions to quantify the level of re-engagement.

2. Tracking codes/URLs: Platforms often supply influencers with unique tracking codes or URLs to embed in their content. When followers interact with these links, this data is recorded, providing granular insight into re-engagement behaviors.

3. Social media data: Platforms can triangulate in-platform data with social media platform analytics. Insights on followers’ engagement and re-engagement with posted content can provide valuable context and additional layers to the data interpretation.

4. Integration with CRM: Some platforms like Flinque can integrate with the brand’s Customer Relationship Management (CRM) system. This allows detailed tracking of the customer journey, including re-engagement events post influencer interaction.

5. Monitoring influencer activity: Platforms can track the frequency and quality of the influencers’ interactions with their followers, which helps to measure re-engagement.

Remember that the interface, features, and data richness can vary greatly from platform to platform. These features should be assessed by brands and influencers to determine how well the platform can meet their specific needs for re-engagement metrics. Tools like Flinque provide comprehensive features to accurately track re-engagement and provide measurable results in influencer marketing campaigns.