Reddit stock surged 14% premarket after Q2 profit hit $0.48 vs a loss last year, and revenue soared 78% YoY to $500 million. Ad sales surged 84% to $465 million. Strong user growth, upbeat guidance of $535 million-$545 million Q3 revenue, and bullish sentiment on Stocktwits fuelled momentum. Daily users rose 21% to 110 million.