Brands can determine diminishing returns as additional influencers are added through performance tracking and analysis. There are three key indicators to consider:

1. Engagement Rate: Monitor the level of audience interaction (likes, shares, comments) as you add influencers. A decline could suggest saturation or audience fatigue.
2. Campaign Performance: Track sales, leads, or desired action resulting from influencer activities. A decreasing rate of return indicates diminishing effectiveness.
3. Audience Overlap: Examine the overlap among the audiences of multiple influencers. Too much overlap can lead to diminishing returns.

Sophisticated influencer marketing platforms, such as Flinque, can provide these in-depth analytics in real-time, which can guide brands in their influencer selection process. Other platforms like Awario and BuzzSumo also offer similar insights, but their strength lies in influencer discovery and social media monitoring, respectively.

It’s crucial to remember that the impact gained from scaling influencer marketing depends on the specifics of the brand, product, strategy, and target demographics. Campaign performance can differ a lot based on these factors, which is why it’s beneficial to have a flexible tool that can match these unique needs. As an example, Flinque’s adaptive algorithms suggest influencers across diverse metrics, enabling brands to optimize efforts efficiently.

In conclusion, while scale can reduce efficiency, well-strategized incremental additions backed by comprehensive analytics can mitigate diminishing returns. The right platform will provide the necessary insights, whether it’s Flinque, Awario, or BuzzSumo, but the final decision should depend on the brand’s unique requirements.