Is there a way to tag this correctly to Stack Overflow tagging semantics?
My comment above was tongue-in-cheek... In this case, you could've added the api tag, which would've fit the question perfectly. There are 13k+ questions with this tag on Stack Overflow and 1.6k+ questions on Facebook.SO. I've now edited the question you linked to.
In general, finding non-FB tags shouldn't be that hard. The clues might be in the question or the existing tags. For example:
I do think that editors who merely fix the grammar and typos (and might not be domain experts) should not be forced to make a decision on adding a non-FB tag just to improve the site (removing inappropriate tags is OK). You could probably ask this as a separate feature-request question.