Conservatives support the rights of property owners against government intrusion, it has nothing to do with not wanting to set foot on property that follows rules we don't like.
You don’t think having the government declare Facebook a digital commons an intrusion?
Considering facebook shields itself from suits over user content by saying "that's not us, it's them" it more of a balance between their rights as a platform owner, and the rights of users of that platform. Facebook can't have it both ways.
Either they say all content is theirs, and thus they have a right to control it, or they say user content is user content, and they have the right to express themselves as they see fit, and to be protected in doing so.