Pinterest Inc (NYSE:PINS) reported first-quarter earnings after the close last night, beating estimates with adjusted earnings of 20 per share on revenue of $740 million. The image-sharing social media firm also issued a second-quarter revenue forecast that was higher than expectations. In response, PINS is up 17.6% to trade at $39.35, on track for its biggest single-session gain since the post-earnings pop on Oct 31.Options traders are piling on following the report. So far, 30,000 bullish bets have been e ...