To me, there are two aspects of that ruling you cited which make it entirely different from social media: 1. "newspapers are economically finite enterprises" -

To me, there are two aspects of that ruling you cited which make it entirely different from social media: 1. "newspapers are economically finite enterprises" - There is a very real cost involved with printing newspapers, while the cost of hosting a social media post is so small it's not even worth mentioning. 2. "the exercise of editorial judgment is a protected First Amendment activity" - Everything that goes into a newspaper has to pass editorial review, meaning the newspaper controls and is responsible for what is published. Social media does not have that.