The social Darwinism suggests that all the individuals, as well as groups of people, are subjects to the totally same Darwinian laws as all of the animals and plants in the natural world are.
Basically, this theory tells us that the human species is acting in the same manner of natural selection as all of the animals do.
Considering the human individuals and societies, and comparing how they act in reality and what the social Darwinism suggests, we we see a lot of differences.
The fact is that the social Darwinism has stopped ''working'' in the human species in some aspects since the development of the civilizations started, and as time passes it seems to be more and more abandoned.