Facebook shuttle bus drivers voted late Wednesday to join the Teamsters union. The vote was 43-28. The union drive was part of a growing campaign in Silicon Valley to secure better pay and working conditions for service workers. The victory could encourage shuttle drivers for other high-tech companies to start organizing drives, said Rome Aloise, International Vice President and Secretary-Treasurer of Teamsters Local 853...Facebook spokeswoman Genevieve Grdina declined to comment. Loop Transportation, the contractor which employs the Facebook drivers, released a statement from its CEO Jeff Leonoudakis. "Loop Transportation respects the election results and the decision of our drivers who service Facebook. Even though we don't feel that our drivers' interests are best served by union representation, our drivers have spoken and we will now begin the negotiation process," Leonoudakis said. [also refers to Apple, Google]