Pinterest shares slid over 12% premarket after Q2 EPS of $0.33 missed estimates by $0.02, despite revenue jumping 17% YoY to $998 million, topping forecasts. Costs rose on AI and infrastructure spend, while monthly active users (MAUs) hit a record 578 million. Q3 revenue guidance beat expectations, and retail sentiment on Stocktwits turned 'extremely bullish' amid hopes for a rebound.