First, let's look at the advice from What are tags, and how should I use them?
Do not use meta-tags in questions. Here are some tips to help you determine whether a tag is a meta-tag:
- If the tag can’t work as the only tag on a question, it’s probably a meta-tag. Every tag you use should be able to work, more or less, as the only tag on a question. Meta-tags, like
[best-practices], are not helpful by themselves – they do not communicate anything about the content of the question.
- If the tag commonly means different things to different people, it's probably a meta-tag. For example, the meaning of the tag
[subjective]is, itself, subjective; the same is true for tags like
[beginner]. Best practices to whom? Beginner by what criteria? Use only tags that have a broadly accepted, objective definition.
Let's, for now, focus only on the first bit of advice. If the tag can’t work as the only tag on a question, it’s probably a meta-tag.
Here is a list of likely candidates:
- delete - The very definition of a meta tag. Runs the whole gamut.
- editing - Useless without other tags. Useless generally. Presumably about changing something in a specific web app, which should already be a tag on the question. No one is an expert on "editing" on all web apps.
- filter - Can't possibly work as the only tag on a question. I see it used for gmail (it should be gmail-filters), google-spreadsheets, yahooemail (which should be yahoo-mail), youtube comments. This also seems to run afoul of the second point above (it means different things to different people).
- photos - This can't possibly work as the only tag on a question. It needs to be paired with a web app. On the first page of questions I see facebook, google-plus, instagram, twitter, gmail, dropbox. facebook-photos and google-plus-photos exist, at least.
- url - Again, this has no context without the existence of other tags.
- web - What could this possibly even mean? Most of the questions tagged are closed. The rest look like web development questions or network protocol curiosity that should also be closed.
So, how should we manage these? This is a problem and it seems to be getting worse. ("Broken windows" and all that.) Should we have a canonical "help clean up these meta-tags" question/answer, or should each individual one get its own question/answer (and arguments)?
There are also some other problematic tags that I think border on meta-tags, but will be harder to justify removing. (For instance, email, based on its wiki, is for any webmail service that doesn't already have a tag. Not that it's used that way, of course.)