Like human beings, software products do pass through various stages of being born, growth, maturity, decline and death. A similar life-cycle will be seen on Facebook. In System Analysis, you should have covered this. Any technology product has to go through a life-cycle of being invented, developed, published, upgraded, revised, replaced or dies. Who knew Ms-DOS would be replaced? And already, chatting applications are replacing SMS technology. So, lets all think smart as left-brain thinkers, Facebook WILL die or get replaced. Same way as programming in QBASIC, newer generation will consider it a dinosaur soon.