Many states punish prisoners for using social media (usually, being used by Facebook). A single post can be punished by a year's solitary confinement.

Solitary confinement for extended periods of time is a form of brainwashing and should not be allowed at all.

Rehabilitation includes teaching prisoners better life habits, and not being used by Facebook is a good habit. But this is the wrong way to teach it.

The South Carolina law seems to punish even writing an article to be posted on the internet.