Quartz
December 26, 2018
"Last year, the US Supreme Court ruled in Packingham v. North Carolina that social-media platforms are the new “public square,” and access to them is protected by the First Amendment, which guarantees free speech. But that doesn’t necessarily mean there are no limitations on how social media can be used when an ex-convict is on probation. For example, a California state appeals court just found in AA v. The People (pdf) that a “narrowly tailored” limit on social media use for a juvenile on probation—in this case for a felony offense—was legal for rehabilitation purposes and to protect a crime victim."
https://qz.com/1507443/a-california-court-finds-social-media-posts-arent-a-first-amendment-right/