Depression is not a social problem due to the fact that it is more of a personal issue that does not involve the prevention of the goals of society. It does not influence the society nor affect it. Depression is a personal choice and it is not influenced by social factors. Since it is a personal choice it can be solved unlike social problems. Depression does not threaten the continuation of society in any way.

Smash -and-grab is a social problem because it affects the whole society. Everyone and anyone can be a victim of a smash-and-grab. It is crucial for the society to be safe so that people can feel safe. If people feel like their safety is threatened it makes them doubt their believe in what society should be like, and they would want to solve the issue ofcourse, which will not be easy.

Rape Is a social problem. It affects and it harms a lot of people. It is not easy to solve because it is caused by people meaning these people will have to change which is unrealistic. 

Fast foods are not a social problem mainly because consuming fast foods is a choice. If one consumes plenty of fast foods their health will be harmed. Even though it is something they could have avoided in the first place, so this makes it a personal issue not a social problem. It would have been a different story if the economy sold only fast foods. 

HIV/AIDS is not a social problem. It is not harmful to a lot of people because it can be avoided. The society knows how to avoid HIV/AIDS. It is the society's choice wether to avoid it or not.