Book of Job Theme of Friendship

Job has some not-so-nice friends, and boy does he know it. But it's not just that the peanut gallery is filled with bullies. Job actually feels like his reputation has been damaged by his views. Social standing is the last thing taken away from Job, and his friends essentially turn on him. Ouch.

1. Do Job's friends respond to his accusations, or are they just trying to shore up their own worldviews?
2. Why do the three men transition from chilling with Job to ripping on him?
3. Where is Elihu in all this? Is he a friend? An enemy? Why is he even in the book?
4. How does Job's reputation look at the end of the book? Is he humiliated, or are his friends?