This is very interesting, angus. Thanks for going into detail on it.
I'd say that in my experience, even though the libertarians show up as very far to the "left" on their social scores, they tend to prioritize economic issues far more than social issues when it comes to advocacy and voting.
I don't know, it may lean one way or the other, but it's certainly very close. I'd guess it actually leans more on the social side than the economic side, but I maybe biased a bit. Gay marriage, guns and pot are just as important as free trade and less regulation. Everything flows from the mindset that people should be able to (generally) do what they want as long as they ain't hurting nobody that doesn't want to be hurt. It doesn't matter if that happens in the bedroom or the boardroom.
I just checked Reason Magazine's last few dozen articles linked to from Facebook. There certainly isn't an economic bias there. Lots of making fun of Trump and over sensitive college students. A little Johnson, a little climate change (is that social or economic?), a little weed. A little economics too sure, but it was countered by a little cop bashing. I'm certainly more in the weed, guns and whores side, it's a lot more fun than the side discussing TPP and zoning.