Q:

Problematic [tags] and [tagging] tags

I draw your attention to tags and tagging.
Not only is one simply the verb form of applying the other (and should thus be a synonym) they certainly seem to be meta tags; neither could be the only tag on a question.
Most, but not all, seem to be for Facebook (but let me also point out the problematic facebook-tagging and facebook-tags, which aren't synonyms either.)
And, let's not forget photo-tagging.
There's some clean needing doing here. And perhaps some burnination.
So, my suggested course of action:

Synonymize facebook-tagging and facebook-tags (I think the latter should be the "master")
Clean up uses of tags, tagging, and photo-tagging to be for the appropriate app

A:

I have cleaned up the tagging & photo-tagging tags.
To assist with the cleanup I needed to create some new tags:

google-plus-tags
instagram-tags
twitter-tags
letterboxd-tags

I have also created a synonym to map all facebook-tagging to facebook-tags
EDIT:
The tags tag has now been cleaned up too.

