Investors aren't excited by Pinterest's revenue forecast. Nikolas Kokovlis / NurPhoto via Getty Images Close Key Takeaways Shares of Pinterest (PINS) plunged after the visual social media and search company missed profit expectations and gave weak holiday quarter guidance. The company posted third-quarter adjusted earnings per share of $0.38, three cents below what analysts surveyed by Visible Alpha were looking for. Revenue rose 17% to $1.05 billion, in line with forecasts. For the current quarter, Pintere ...