
Pinterest stock plunged 20% after reporting weak Q3 2025 earnings and issuing a disappointing holiday outlook. The social media giants adjusted EPS missed estimates, while North American ad revenue slowed sharply, erasing its 2025 gains. Despite hitting a record 498 million monthly users, investor focus shifted to declining monetization and margins. Adding pressure, Metas $70–72 billion AI spending plan spooked markets over profitability risks. Pinterest closed below $31, its lowest level this year, as ad slowdown fears hit social media stocks broadly.