I know this has nothing to do with illegal content, but someday posting negative views on vaccines may become illegal.
I've already been threatened with a lawsuit for my vaccine articles. there is nothing illegal going with my articles, however they are controversial because I use independent studies that are not pro-vaccine. I threatened the commenter with an anti-slapp motion, Oklahoma is pro anti-slapp
The bottom line -- without an anti-SLAPP statute, a malicious litigant can often inflict substantial expense and hardship upon someone in retaliation for their speech, even if their claim lacks merit, and do so with relative impunity.
http://www.batesline.com/archives/2014/04/oklahoma-adopts-anti-slapp-law.html