Investors File Suit Against Facebook, Underwriters By DAVID BENOIT Three Facebook Inc. investors filed a civil lawsuit Wednesday in Manhattan federal court, alleging the company and its underwriters failed to properly disclose changes to analysts' forecasts made at the underwriting banks. The suit follows reports that analysts at Morgan Stanley and Goldman Sachs Group Inc. cut their revenue forecasts on Facebook amid the investor roadshow, a change that wasn't widely disseminated. Late Tuesday, Massachusetts sent a subpoena to Morgan Stanley following the reports. Several other plaintiffs' lawyers have said they filed suits over the offering in other courts throughout the...