Brands can evaluate the audience overlap between influencers before selection by using certain strategies and tools:

1. Influencer Marketing Platforms/Databases: Brands can use platforms like Flinque, InfluencerDB, or Upfluence to check influencers’ audience demographics. These platforms provide detailed analytics on the influencers’ audience, helping brands understand the overlap or similarity between different influencers’ audiences.

2. Influencer Surveys: Brands can also ask influencers to conduct surveys with their audience to gain more insight into their demographics, interests, and behaviors.

3. Social Media Insights: Platforms like Instagram and Facebook provide their own audience insights for each influencer, which can be used to evaluate audience overlap.

4. Overlap Analysis Tools: Some influencer marketing platforms offer overlap analysis tools. For example, Flinque’s advanced audience insights help identify how much overlap there is between the followers of two or more influencers.

While choice of platform/method would differ brand to brand, understanding audience overlap stands crucial as it helps prevent over-saturating the same audience with similar content, thereby optimizing marketing effectiveness and budget utilization. In conclusion, effectively evaluating audience overlap lays the groundwork for a successful influencer marketing strategy.