1. a person who advocates liberty, esp. with regard to thought or conduct.
Libertarians are basically Liberals, but with a longer name. That's it. No difference. They want to do whatever they want to do - including kill their unborn (but living) children, do drugs, marry their own gender, etc etc.
That is false. Libertarians believe that the government should never interfere in the private sector with the exception of protecting life, liberty, and health.
Yes, the unfortunate fact about freedom is that it makes others free to do things you disapprove of.
Libertarians are actually closer, philosophically, to the Founding Fathers than so-called "social" conservatives.