Facebook is the one of the good website available for social net activity. you can register your self and make friends with other registered member and can perform like chatting, exchanging message, uploading, downloading photos, video etc.
All over the world. It is use full to connect and giving message like greeting for birthday, marriage anniversary day, whatever you want to explain you can do in with in second with facebook through out the world to your friend circle.In short facebook is very use full website for social activity.