1 - Which firms are the biggest players in the sector, often referred to as "the sharing economy" or "collaborative consumption"? Have you used any of these firms? What was your experience like? Would use them again or recommend them to a friend? Why or why not?

2 - Who startedFacebook? How old was he then? Now?How much control does the founding CEO have over his firm? Why? What is a social graph? Why isFacebook'ssocial graph considered to be stronger than the social graph created by the sites of its early competitors?