@humanetech @gme @cope afaik mastodon supports viewing edits but not creating edits (i think i heard somewhere they're holding off until edits are more widely supported first, but don't quote me on that I've not bothered to confirm it)
akkoma and i think pleroma develop support both viewing and creating edits
and misskey (or at least foundkey) supports neither currently

i don't know what the support state is in others like friendica, gnu social, epicyon, pixelfed, or gotosocial