Pinterest Inc (NYSE:PINS) stock is plummeting this morning, down 10.3% to trade at $36.52 following a disappointing forecast from the social media company. Pinterest said first-quarter revenue will fall between$690 million and $705 million, with the middle of that range falling well below the average analyst estimate. And while the company beat on fourth-quarter earnings expectations, it fell short of revenue estimates. Puts are outpacing calls at an alarming rate following the report. So far, just 32,000 ...