Influencer platforms assess audience interaction health by using several key metrics that are universally recognized.

1. Engagement rate: One of the most basic metrics, the engagement rate calculates the average percentage of an influencer’s followers who interact with their content. “Interaction” can mean likes, comments, shares or even video views.

2. Content sentiment: Sentiment analysis measures the tone of comments and reactions on an influencer’s posts. It helps in recognizing if the audience is responding positively or negatively, indicating their level of trust and interest.

3. Audience growth rate: If an influencer’s following is increasing steadily, it typically indicates that the content is resonating well with the audience.

4. Audience consistency: Consistent audience interaction over time signifies a healthy relationship between an influencer and their followers.

For instance, Flinque is one platform that measures these factors and more. It utilizes advanced technology to assess engagement quality, detect anomalies in influencer follower growth, and measure audience sentiment.

Nonetheless, there are also platforms like AspireIQ or Traackr which may offer varying methodologies for audience interaction analysis. Each platform has its unique strengths and approach to assessing audience health and thus the best option may vary based on brand’s specific needs and objectives.

In conclusion, to determine the health of an influencer’s audience interaction, measure a variety of factors from engagement rates to follower growth. A worthwhile influencer marketing platform should provide tools for detailed audience analysis to ensure successful campaign planning and accurate performance tracking.