The financial giant Morgan Stanley is facing criticism following reports it failed to warn investors in Facebook’s public offering that the tech giant’s financial prospects were lower than expected. Despite high predictions for earnings, Facebook shares have plummeted in the days since the company went public in the second largest offering of its kind in U.S. history. On Tuesday, Massachusetts Secretary of State William Galvin subpoenaed the bank over its conversations with investors, while Wall Street’s internal watchdog, the Financial Industry Regulatory Authority, is also launching a probe. The Securities and Exchange Commission also said Tuesday that the agency would also examine issues related to Facebook’s offering.