Ask HN: What is with the new URLs on facebook.com?

Re:Ask HN: What is with the new URLs on facebook.com? by Someone on Saturday July 16, 2022 @10:31AM (#32118519)

Problem, I think, is that only Facebook can know the X such a url points to without accessing it.

So, upon seeing a new one, you’ll have to resolve it. Only then would you be able to tell what other URLs it’s equivalent to.

One way to gain anonymity there is to do that from a proxy, but such proxies would be detectable from the amount of pages they request from Facebook.

It also looks like they already thought about replays of URLs. For me, https://www.facebook.com/VICE/posts/pfbid02XdVziPTwhmPU9XzBq... currently says:

“It looks like you were misusing this feature by going too fast. You’ve been temporarily blocked from using it.

If you think that this doesn't go against our Community Standards, let us know.”

So, chances are they also thought about users exchanging URLs (e.g. by having each running instance of Firefox read Facebook URLs for other instances). It is possible that (a part of) your Facebook user ID also is encoded in each URL.

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Re:Ask HN: What is with the new URLs on facebook.com? by dredmorbius on Saturday July 16, 2022 @07:30PM (#32122903)

So create an extention which feeds the URL to FB when it is first requested, find the canonical URL, and return that to the clipboard / share dialogue.

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