I am still learning and wondering how many get this notice...

A lot depends on your settings as well who has muted or blocked you.

If your interests on your profile are limited you're not likely to see certain posts

If you have checked off you're interested in family safe posts you're not going to see those posts that are rated as adult and most certainly not adult-nudity.

The system also puts its own ratings on posts that are not changable by the posters so the system does scan through your posts. Just to rate them if not anything else.

There's a lot more going on behind the scenes than most know about on this site.