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4:59 AM
I have created the tag on meta. I used it for this bug report: Why is community bulletin no longer shown on MathOverflow? The situation has been resolved - but I suppose there's no harm if I do not delete the question.
This is the second time I have created the tag: chat.stackexchange.com/transcript/10243/2017/9/17 However, I deleted the previous question - since in the previous instance I realized it was a network-wide issue and I posted it on Meta Stack Exchange instead.
 
 
12 hours later…
5:05 PM
I will post here some examples showing that there are instances of tags which are blacklisted while they still exist. This is in connection with my post on meta: The existing deprecated tags should be blacklisted.
The examples I was able to to find are from Stack Overflow. From what I read on their meta, it seems that hidden-features and code-golf are blacklisted - although they still exist on some questions.
In fact, in both cases the tag-wiki explicitly says the tag is currently blacklisted.
> This tag is blacklisted (see The mystery of hidden-features tag), use this search to list them all.
> Note: This tag is currently blacklisted and can no longer be used.
I found these tags here:
5
A: What tags are already supported by how-to-ask tag tips?

Shog9Right now? Just sql. There is guidance associated with a few other tags... But those tags are blacklisted - you can't submit the question if you use them. Currently on Stack Overflow, google, hidden-features and code-golf fall into that category.

There are posts on their meta showing examples what happens when somebody attempts to use such tag.
4
A: The mystery of hidden-features tag

Shog9You point out something I'd forgotten about: we never blacklisted this tag. I've remedied that: Given these questions cannot be edited, this serves to preserve the categorization of those in the archives while discouraging folks from posting new ones.

14
A: Burninate [code-golf]

Shog9The remaining questions are a part of Stack Overflow's history. Or mistagged. Either way, there's no particularly good reason for using this tag on any new questions, so like hidden-features before it this is now blacklisted:

 
5:52 PM
In fact it is possible the the information about (hidden-features) was incorrect. We will see whether I get at least some answer here; Was the (hidden-features) tag “unblacklisted”?.
However, when I tried to put (code-golf) into the tag field, I got some warning. It looked like this:
 
6:11 PM
This would be a possible explanation:
Blacklist items automatically expire if they are never triggered for some amount of time. It's possible no one tried to use it for too long. — animuson ♦ 1 min ago
We'll see whether we'll find out more details about that.
 
 
2 hours later…
8:28 PM
0
A: Help cleanup tags!

Sam HopkinsI think it might make sense to make polytopes a synonym for convex-polytopes. Although non-convex polytopes are sometimes studied, convex ones are much more prevalent. Also there are only 36 questions tagged "polytopes" while there are hundreds tagged "convex polytopes."

 

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