I never really got the individual v. society from the novel. For me, the predominant message was that of never giving up. But, now that the point as been raised, I can see it. The posters have really brought to my attention that there is a large underlying message about the individual v. society.
Go back to the story and check on how Susie's mother tried in so many ways to find herself again after Susie's murder, and how she had to break from the expectations bestowed upon her as a mother. Her leaving the house and walking away from the family may seem like a radical thing for a woman to do in times of mourning, but it was the only thing she could do. Hence, this is important because she was one woman against how society and her family expected her to behave.
I would want to look at passages that reflect Susie's father's conviction that their neighbour, Mr. Harvey, was responsible for his daughter's murder. He is forced to try and work himself to prove his guilt as the police do not agree with his ideas and indeed make fun of him. This is a classic example of the way that an individual is often forced to work outside the confines of society.
The best example I can think of is that the police often give up on cases long before loved ones are ready. When they can't find any more leads to follow, they stop looking. This is also true if you're dead and want your killer caught!