Can you explain the difference? Googling it is quite hard, as it mostly throws me biased views.

In the U.S.:

"Liberalism": Broadly, what other countries call social liberalism, i.e. liberty, individual rights, equality, all rooted in Locke's notion of the social contract.

"Libertarianism": An American revival of what's formally called classical liberalism. Broadly: Small government, strong individual rights, free market capitalism, etc.

No, they are using the term “liberalism” in its historic meaning, not the current, US meaning.