Not her greatest work. But I think an excellent book to give to an adolescent who is curious. It illustrates quite well how her primary concerns are really about freedom and the avoidance of rigid strata in society. That you should be free to rise or fall based on the quality of your intellect, character, and hard work.
It is a dystopian novel set rather far into the future after some cataclysmic event. collectivism is taken to the ultimate conclusion, even to the point that the use of the word "I" is a crime punishable by death. Where all "FACTS" are only those facts that everyone agrees upon and the freedom of expression is acceptable only if all agree that what you say is aceptable. (with the obvious end results!)