Those videos are horrible. I'm not exaggerating. But be forewarned.
I clicked on one, just one, and it took me days to get it out of my head, even though I saw nothing and the visual was almost entirely blackboxed. Just the understanding of what was happening and to whom did me in.
So be aware that if you do this without really knowing in advance what you're clicking on, it may fuck you up for a while.
You have been warned.