Facebook is very useful social networking site I talking by facebook facebook messenger service is very good
Its the top of all social networking sites to connect people. In the initial days of facebook there any many old friends met after so many years. Even there are some people who met in facebook and they had started their love life which leads to marriage aswell.
Main thing is you dont feel that how much time you had spent in facebook. When you feel bored then go to facebook and have fun.