I'm guessing what they mean by that is certain kinds of hentai I shall not name here, as well as underage models.

Those are things I inadvertently ran into over a decade ago, but these days that virtually never happens, especially in terms of the latter.

And no, I didn't search for those things, so don't make jokes.

The characterization that mainstream social media platforms are "filled" with such material seems disingenuous, unless I've been living on a completely different planet. I'm sure it exists but I believe that you'd have to actively seek it out.

I'm talking about the underage models. It's a bit different from kids self posting content, that then attracts creeps vs the underage models that have an entire organization/staff of adults that are taking photos and selling them.

I'm not on social media very much at all, but- my partner used to spend quite a bit of effort reporting Instagram accounts advertising this stuff. Reports were routinely rejected, and she eventually burned out on it. Meanwhile, misinformation is very actively and preemptively policed.

Yes, you'd probably have to seek it out. But, what was troubling is how it's just routinely ignored, despite reporting.

eg: the cover art of Nirvana's album Nevermind, or the title of their egregious but iconic title "Smells like Teen Spirit".

/shrug

Teen Spirit was just a popular deodorant at the time! But the first example makes sense.

At least one so-called "grey area" involves teenagers wearing revealing outfits or posing in potentially sexual ways. As far as I understand it most police forces do not waste their time with such imagery, even though it may technically be illegal, because there is just so much unambiguous child abuse imagery to deal with -- teenage girls taking pictures of themselves is a lot less alarming than a 40 year old filming himself abusing a 3 year old.