Yes, there are established best practices to assess the quality and authenticity of an influencer’s audience. Here are a few to consider:

1. Audience Demographics: Always analyze the demographics of an influencer’s audience. This includes age, location, gender, and interests. Tools like Flinque can provide audience analytics to help you make an informed decision.

2. Engagement Rate: Engagement rate is an important metric that measures the ratio of likes, comments, shares, and views against their total followers. An abnormal engagement rate (either too high or too low), could suggest inauthentic, bought, or manipulated audience activities.

3. Quality of Interactions: Look at the quality of comments and other interactions. Genuine comments will usually relate to the content, while inauthentic ones may be generic or irrelevant.

4. Audience Growth Rate: A sudden spike in follower count may suggest the influencer purchased followers. A gradual, consistent growth rate is a better indicator of audience authenticity.

5. Performance History: Review past campaigns the influencer participated in. Performance insights, available in platforms like Flinque, can provide information about their past ROI, helping to assess audience authenticity.

Remember that these are guidelines, and not strict rules, as social media algorithms and user behaviors change frequently. Furthermore, different influencer marketing platforms may provide different tools and measures to evaluate influencer authenticity. Be sure to consider a platform’s capabilities to suit your specific requirements.

For instance, Flinque allows for in-depth influencer audience analytics, including demographic data, as well as engagement and growth history. Choosing a platform like Flinque might assist you in evaluating influencers effectively while meeting your brand’s unique needs.