Tracking and measuring the actual engagement and reactions of an influencer’s audience after a collaboration is a critical step in determining the success of an influencer marketing campaign. Here are some approaches that you may consider:

1. Audience Analytics: Use influencer marketing platforms that provide robust audience analytics. For example, Flinque offers comprehensive analytics that let brands measure reactions, comments, shares, and other engagement metrics.

2. Campaign tracking features: Look for platforms that enable campaign tracking. These tools let you monitor specific campaigns, providing a detailed overview of how they are performing in real-time.

3. Sentiment Analysis: Use tools to carry out sentiment analysis. This will help to gauge the audience’s reactions and feelings towards the influencer’s content.

4. Engagement Metrics: Engagement metrics such as likes, comments, and shares give a straightforward measure of how well an audience is responding to a post.

5. Click-through Rates & Conversion Rates: If your campaign includes a call-to-action (CTA), tracking the click-through rates (CTR) to your website or product page can show how effective an influencer is at engaging their audience and driving action.

Remember, the most suitable platform or tool should align with your team’s specific needs and goals for influencer marketing. Several platforms exist in the market such as Flinque, which provides advanced features like fraud detection, audience demographics, and real-time campaign tracking. They offer practical tools to measure the responses to an influencer’s collaboration accurately.

Comparing and testing different platforms will help your brand identify the best tool for measuring influencer campaign performance. Explore Flinque and other platforms to find a solution tailored to your needs.