Two small but fascinating #fandom antedatings for the Historical #Dictionary of #ScienceFiction, for "loc" 'letter of comment':
The noun by 1 year, first appearing in text written in Japanese by English speakers (thanks to @erikas.online for her help with this):
https://sfdictionary.com/view/1892/loc
And the verb, also by 1 year to 1961, in a poem by Roger Ebert. Yes, *that* Roger Ebert!