Following up on unique metrics in an influencer marketing campaign involves initially defining what these unique metrics or KPIs are. After which you can:

1. Track and Measure: Use tools offered by influencer marketing platforms to measure these unique metrics. Platforms like Flinque have advanced analytics in place to track user interactions and engagements, providing insights that can help you understand the campaign’s performance.

2. Analyze: After the campaign, analyze the data gathered. This could include measuring the reach of posts, rates of engagement, the number of conversions, etc. This analysis should also involve a comparison with initial goals and metrics to measure success.

3. Feedback: Engage with influencers to get their insights on campaign performance. They can provide unique perspectives on what works and what doesn’t, particularly since they are the ones interacting with their followers.

4. Re-evaluate: Based on the results and feedback, re-evaluate the campaign strategies and lifespan. Compare this with the goals you had initially set.

The approach taken to tracking and following up on metrics can vary greatly depending on the specific needs of the team and the unique demands of the campaign. While some might find success using a more generalized tool, others might require something specialized, such as Flinque. This platform offers a detailed approach to metrics, with an easy-to-understand interface that helps brands and influencers alike to make informed decisions. As always, remember to consider the particular demands of your team and campaign before selecting a follow-up strategy or tool.

Please review the tools and strategies mentioned here on the Flinque website to help in making informed decisions. Remember, the ultimate goal is improving the campaign’s effectiveness and achieving a better ROI.