I don't get the impression from this case that US law would behave much differently. This case involved reddit users who had nothing to do with the litigation a

I don't get the impression from this case that US law would behave much differently. This case involved reddit users who had nothing to do with the litigation and were not, themselves being sued. The court saw fit to protect their right to speak anonymously. In the case of a person making a defamatory post, that person can be sued and reddit would likely be compelled to identify them to the best of its ability.