I.. can't say I've ever even heard of it. I know of Tinder, Grindr, etc, but have never used those. I've also used a dating site in the past, and I know about adult friend finder etc. (also haven't used). I'm guessing it's something similar to those?
Annnnnnnnnnnd I actually just looked it up and that is some scummy stuff. People taking footage of someone without their knowledge or consent then posting it online. Bleh.
Being pervy, sexual, sex positive, whatever? Great. But. Consensual. Always consensual.