http://mediashift.org/2010/05/cda-protects-newspapers-from-liability-for-libelous-comments132/
https://www.eff.org/issues/bloggers/legal/liability/defamation
https://www.nolo.com/legal-encyclopedia/defamation-law-made-simple-29718.html
https://scholarship.law.duke.edu/cgi/viewcontent.cgi?article=1016&context=faculty_scholarship
https://injury.findlaw.com/torts-and-personal-injuries/elements-of-libel-and-slander.html