Libertarian - values personal freedom, private property, and minimal inference of the state. Citizens are independent and self reliant.
Socialism - No private property, property is owned collectively or by a centralized government that often plans and controls the economy.. Maximize the size of government and government intervention in the lives of its citizens. Citizens are dependant upon the State.
You can not be dependant and still be free.
Government is the only organization specifically granted the power to use force to achieve its goals.