Entrepreneur Gretta van Riel shares her influencer marketing strategies for scaling ecommerce brands, including product-for-post campaigns, negotiating with influencers, and tracking conversions. She discusses the importance of working with influencer co-founders, utilizing the tiered micro influencer approach, and leveraging platforms like Twitch. Van Riel also emphasizes the value of direct-to-camera selling and post-purchase surveys to track influencer impact.