[lazyasciiart]

As you may have guessed from the downvotes, this is not even close to accurate. It should have been possible for you to realize this was inaccurate simply from how trivial the problem looked to you in comparison to how much effort is being spent on it.

[nonwifehaver3]

I genuinely don't understand how an average Facebook user would encounter videos like those described in the article. Is it some recommender system gone awry?

[lazyasciiart]

As far as I know, mostly because people post them as comments on public or widely shared items, along with "get free sunglasses" and every other kind of spam. There are tons of these public posts from pages that do news, memes, politics, trolling, regular advertising, whatever.