It was rising at the time with a lot of discussion before it disappeared from the list of posts.
I cannot see it on any page. The only way to access it is via a direct link or the search:
https://hn.algolia.com/?dateRange=pastWeek&page=0&prefix=false&query=instagram&sort=byPopularity&type=story
but now I guess they'll remove it from there too. Why?
"On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic."
The thing is that this "sex vs free speech" topic has been going on for a long time. There are plenty of other sites to discuss it.
It is also the kind of thing that people would be unnaturally attracted to, and yet is low quality content - it has sex, and also seems to be about challenging human rights.
I think it's good that this kind of thing is buried quickly, because more news of this type are not very interesting.
Maybe there's data backing the validity of it up though, I don't know.