It depends, I think. Generally, when the thread is reasonable, but a few posters get carried away (euphemism) then individual posts are deleted. If the thread is so littered that it becomes a bit silly, then the whole thread goes.
It's often the same post/poster that gets people's attention enough to report.
The late night trolling also often comes in the form of a single poster who goes from thread to thread (on whatever subject) posting really unsavoury stuff that will without a doubt be deleted by HQ.
Those type of trolls are really awful as they seem to pick sensitive subjects and just leave one inflammatory response.
To the OP returning to that thread, such a post can be upsetting, and worrying.
It would help if a ban or posting suspension could be implemented if a single poster is repeatedly reported in the space of the same evening.
I've often found myself searching the name and reportig each post, whilst trying to 'help' any poor unsuspecting OPs that have returned to their threads to find a vile response. And I'm not the only one.
The long threads (like the Worra one) are irritating, but the super vile multi-thread trolls are especially beyond the pale IMO.
I think we should have volunteers who get an algorithm from MNHQ - a fancy flowchart with action to take in each situation....with a Bat-Phone, perhaps. Breach of the chart results in withdrawl of privilege.
BIWI that's been suggested before but it's been pointed out that then someone only has to report it X number of times, no matter if it needs reporting or not, and it's gone or locked or whatever. Trolls would have a field day!
It would be helpful for MNHQ to be able to suspend a particular post or posts while they considered action.
Rather than having to make a snap decision to delete, they could just 'hide' the post with a message saying 'awaiting decision' or an alternative.
The trouble is that the overtly awful threads (with exception of direct attack as Worra experienced) are not the ones that do the most damage. The ones that do the most damage are the ones that are 'grey' in themselves, but together with others build up a picture that is very unsavoury.
Thinking specifically of SN here, there is a pervasive message that comes across which does need challenging, but it can still be quite hard to pin individual posts down as deletable, despite the overall message being clear.
I didn't see the thread last night so I can't comment on how quickly it needed to be deleted.
However, I do think we sometimes have an expectation that just because something is reported, MNHQ will do what we think they should do. And that we need to give them time to read a thread before they can decide the correct way forward with it.
Some, yes, should be obviously deleted. But I think people get het up about grey area ones and feel ignored very rapidly.
My suggestion would be a message, on thread, saying 'we are aware of this thread and are investigating. Please bare with us.' so that we know it's at least been reported, even before a deletion message or deletions appear.
Worra's 'call out thread' was left up by accident, as HQ said they had a technical glitch. The internet isn't fault proof, after all. If it was, it would be a much more boring place.
Still, having threads like that will change the flavour of the site for the worst. And, unfortunately, not everyone is so robust. Cyber bullying in any form is unacceptable to me, as it's a lot more pernicious then real life bullying due to its 24/7 nature.