Can I get an answer once and for all? +Question about social media and how it is monitored?

[Cass]

So I'm 17, and I love reading. I discovered fanfiction a few years ago, and have been reading it since. Two months ago, I came across some articles saying fanfiction was illegal. I understand the copyright issues, but after some research, and many questions here on yahoo answers, I am coming to ask for a final opinion. Is reading mature content illegal? What about Harry Potter "underage" content? I'm not talking children, I'm talking kids my age, 16 or 17 years old.

Now for the question about social media. I have a friend on facebook that writes in their statuses "getting high" or "smoking and watching p$3n.". Now, to my knowledge, both of these things are illegal in my state. Is there any monitoring by the government or websites in general to help kids with these issues? I mean the person is younger than me and clearly needs help. :/

Oh yes, and I researched and reading sexual content is not illegal in my state, but watching it and illustrating it is. Also, to my knowledge it is protected under the first amendment.

All help is appreciated!
And I've been worrying about it so much because I have anxiety issues and I just need a final answer. Thank you so much for helping! (: