Explain, in as much detail as you believe necessary, collective conscience, as offered by David Emile Durkheim. Discuss the similarities and differences of class consciousness and collective conscience and indicate to what, if any, extent, the two concepts are interchangeable. Do you believe collective conscience is a useful tool for understanding sub-cultures that involve fashion, music or technology fads? Thoroughly explain why or why not. Use an example, such as "hip hop," "grunge" or "dance music," iPads, iPhones or other technology, to illustrate your answer.