Shares of eBay (NASDAQ:EBAY) fell 3.7% Friday morning as investors reacted to Meta's launch of a dedicated Seller app for Facebook Marketplace. Historically viewed as an informal, local yard-sale platform, Facebook Marketplace's standalone "Seller" app introduces tools specifically engineered to siphon professional, high-margin power sellers away from traditional e-commerce platforms like eBay. Meta's built-in AI handles auto-categorization, title generation, and suggested pricing straight from uploaded photos, drastically undercutting eBay on time-to-list efficiency. The new Seller app's unified inbox, task dashboard, and bulk-listing tools plug that operational gap—keeping high-volume merchants natively inside Meta's ecosystem. Related articlesMeta's new seller app hits eBay where it hurts mostDeckers beats Q1 earnings, raises guidance—but shares slide 3.5%Oracle lands $7 billion Department of War software contract, sending stock higher