The first step in testing influencer channels is to clearly define your campaign goals and KPIs. It is crucial to understand what results you expect from the influencer campaign.

Secondly, select a diverse range of influencers across various channels. For example, on Instagram, target influencers with high audience engagement. On YouTube, select those who produce high-quality videos.

Next, use influencer marketing platforms like Flinque or similar tools to get insights about these influencers’ audience demographics, follower count, engagement rates etc. Analyzing their performance can expose strengths and weaknesses of different channels.

After the research, on a small scale, launch preliminary campaigns. Measure performance based on pre-defined KPIs. Trial campaigns can reveal not just the effectiveness of each channel, but also help identify the best storytelling format for each.

Post-campaign, compare results and take note of where the most engagement or conversions happened. These results should guide your decision for a larger scale rollout. Remember, performance differs greatly based on brand and product. Instagram might work better for a fashion brand, whereas LinkedIn could be better for B2B products.

In conclusion, a combination of research, careful influencer selection, trial campaigns, and deep analysis should provide insights for a larger influencer marketing rollout. It’s a constant cycle of learning and optimizing, which platforms like Flinque can facilitate with their powerful analytics and tools to help brands make more informed decisions.