tumblr: - iirc this is also used on derpibooru, used to group askblog related images (edit: [yes, it is](https://trixiebooru.org/tags?tq=tumblr%3A*)) zine: - for fanzines
amv: - i've been using this for images based on/frames from warriors amvs, but can be used for other fandom amvs
map: - same as above but for multi-animator projects