The computer is a tool. There is no difference with the phone for example. Maybe you can talk to the closest members of your family first. But my experience is that once you change your status on FB, people begin to congratulate you immediately, regardless of whether it was by phone, computer or directly that you informed them about your engagement. Another thing, FB is a great tool for the people that is helping you with your wedding (say wedding coordinators, photographers,...). It approach to them in a fabulous way. It helps you to get a closer relationship with them at the moment of your wedding. Gonzalo