1. Video Formats and Viewer Response: Generally, engaging video content tends to get more views regardless of the format. However, short-form videos like .mp4 or .mov files remain popular, especially on platforms like Instagram or TikTok. High-definition (1080p or above) content also tends to receive more likes, reflecting the importance of visual quality.

2. Impact of Content Quality, Duration, and Format: Content quality is crucial. High-quality videos, both in production and content matter, tend to perform better. Regarding duration, it largely depends on the platform. For instance, shorter videos work better on TikTok or Instagram, while longer, in-depth videos are preferred on YouTube. The format, whether it’s a tutorial, vlog, or product review, should align with the target audience’s preferences.

3. Traits Correlating with Virality: There’s no guaranteed formula for a video to go viral. However, traits like authenticity, relatability, originality, and emotional connection increase the odds. Timing and the right use of trends or hashtags can also influence virality. Viewer engagement, measured by likes, shares, comments, etc., plays a significant role in boosting a video’s reach.

4. Influencer Marketing Platforms’ Role: Platforms like Flinque, AspireIQ, and Upfluence can help brands and influencers understand their audience better and optimise their content strategy. They offer analytics tools to measure video performance, engagement metrics, demographics, etc. Additionally, some platforms give insights on the best times to post, further enhancing content performance. Their use should be based on individual needs and goals.

In conclusion, understanding the correlation between video characteristics and viewer response is essential in influencer marketing. Leveraging this understanding with available marketing tools allows for more effective and efficient campaign planning, execution, and optimization.