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> Our caching ruleset was not obeyed by our CDN partner. [...] Before the site was shut down, you may have viewed some pages as another user.

What CDN would not respect "caching rulesets"? Cache-Control: Private and Vary: Cookie are well-established.

> We will follow up tomorrow with a further technical explanation of what occurred.

I can't wait. I hope they're being honest and this was a genuine error of a third party, and not incompetence on their end.

They use Cloudflare. I doubt they would not respect Cache-Control.
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This was not an issue with Cloudflare.
"during the update process our caching ruleset was not obeyed by our CDN partner" makes it sound like it.
Twitch response to salted passwords:

> The answer is "yes and no," and we'll cover this in more detail in the forthcoming technical explanation of tonight's events.

So I guess old accounts' passwords are not salted. Still, I'll be waiting for the technical explanation.

Not that it particularly matters if they were salted or not.
Judging by the comments and memes on that page, Twitch's community has some very toxic and juvenile members.
It's a website to watch video games; that's exactly what I'd expect.
I think its unfair to stereotype a community made up of people of all walks of life based on a sliver of a sliver of its members. What's different about gaming than reading books or watching movies or playing soccer that makes gamers toxic and juvenile?
Stereotyping is always oversimplifying, but I agree with sejje. Every group has their vocal, toxic, and juvenile minority. And, in this case, the behavior in the comments matches my experiences with the vocal, toxic, and juvenile minority of gamers.
Judging by the comments and memes on that page, gaming community has some very toxic and juvenile members.
It's worth mentioning for context how long this outage lasted. It started at around midnight eastern and only came back at around 8am today.

Furthermore, before the outage, people were able to view other people's account details without doing anything. It definitely seems like it was a caching issue in that regard - nobody attempted to do anything other than use the site and they saw other people's data.