besides people could find long-lost friends through only typing in thier full name or search for them on their mutual acquaintances, friends lists. moreover ,there are a lot of instances when people found their life partner on facebook as most of us tend to find it easier to start a chat with a stranger on facebook-you see the person's picture,which means that they are not totally unknowns to you, but at the same time you are not standing face with them and you will probably not feel that much nervous as you would in a personal meeting or a date