Please document the difference between Libre.fm and GNU FM
What the title says. I've looked in a bunch of places, but I can't find a cohesive and clear explanation of what the differences between GNU FM and Libre.fm are.
Yes, I understand GNU FM is a piece of software and Libre.fm is a hosted service, but I can't figure out e.g. if Libre.fm runs a (possibly patched) GNU FM, if they federate, etc.