In general conservatives seem to be more close-minded. It makes sense, really - they want to keep things the way they are. Liberalism on the other hand encourages introspection and change; informing oneself is a necessary part of that. So, those that distribute information are likely to be less conservative. You see the same trends in technology and science in general.

Note that this is not an absolute endorsement of liberalism; change can only be positive if people are properly informed, and doing it for the right reasons. And, well, they aren't - not for some time now. And it's been hijacked by identity politics (some is very good; some very bad, more to do with narcissism than anything else, sigh)