I can't find any laws that would apply in Norway's or Minnesota's criminal codes. The only laws there that I can find concern threats against specific people and threats to commit terrorist acts. People saying "death to Lorem-Ipsumland" is most likely just going to be taken as free speech.

When I'm referring to "illegal content" I'm honestly specifically thinking of websites used in the proliferation of drugs, snuff, and sexual abuse material (incl. drawings thereof), and websites used to plan real-world criminal acts. It's also illegal to share memes based on anime fanart due to copyright infringement, but you don't really see anyone worrying about that, do you?