the 5 analyzed ecommerce sub-verticals Domain What it likely contributes amazon.com Marketplace/category coverage, availability, pricing context, alternatives, commercial destination signals. youtube.com Creator validation, reviews, demonstrations, comparisons, troubleshooting, real-world product use. reddit.com Community validation, user questions, complaints, comparisons, recommendations, troubleshooting. ebay.com Marketplace coverage, resale/used-product context, availability, pricing alternatives. walmart.com Retail availability, store/local context, category coverage, pricing/promotions. etsy.com Marketplace/category coverage, gifts, niche products, handmade/custom product context. facebook.com Social validation, local/social discovery, community or profile context. instagram.com Visual validation, style/product inspiration, creator/user discovery. wikipedia.org Entity, brand, category, or historical reference context in some cases. target.com Retail/category availability, alternatives, pricing context. tiktok.com Creator/user validation, trends, visual product discovery. pinterest.com Visual discovery, styling, ideas, inspiration-oriented shopping context.