Through a very academic approach to the problem, the scientific approach is best to help us understand how people get jobs. I originally read this book as an undergraduate in a labor economics course, and I have recently consulted it again (10yrs later) and found many insights I had not caught the first time around.
Yet, those immediately around us may not be very useful in helping us find a job! Our close associates know what we know at the same time we know it! Therefore, they are not very useful for telling us something new -- like where a job opening is. To find out about jobs, we don't already know about, we need to go outside of our immediate social circle to connect to people we don't see very often any more[old friends, college chums, old army buddies, former co-workers, old sorority sisters]. They now live in different social circles than we do. These social circles have information not available in our social circle -- some of the info is about job openings.
This classic book is still highly relevant and useful after 30 years! The book is somewhat 'academic' in parts, but is so full of 'gems' that it is worth slogging through the research numbers. Every college graduate should read this book and keep it handy till they retire.