To me the headline says "you can't be banned from any part of the internet for any reason," or, alternatively, "everybody has a right to access the internet." The actual ruling is much narrower: "it's unconstitutional to ban all sex offenders from accessing social media sites." The Court hasn't officially said anything about other people (e.g., current prisoners, people on probation, specific people convicted of computer-related crimes, etc.) or other sites on the internet.

I was responding to the questions "With this supreme court ruling, how prisons in the US are going to allow inmates to have access to the real Internet? I mean you can not ban those inmates from accessing the Internet, right?"

I think his point was the rule isn't in relation to prisoners who traditionally do not have free access to all of the resources a free person might.

Exactly. Prisoners lose a great many 'rights' when they are incarcerated. Internet access is one of those.