The Atlantic [no paywall] “…The joy of Reddit comes from it being simultaneously niche and expansive—like an infinite world’s fair of subcultures, fandoms, support groups, and curiosities. There seems to be a subreddit for everyone and everything. There are mainstream subreddits with popular appeal, such as r/askscience (26 million users) and r/technology (18 million users). But there are also more esoteric forums, such as r/rentnerzeigenaufdinge, the German-language subreddit that’s devoted to context-free photos of retirees pointing at random things. (That group’s stated purpose: Hier bekommen alte Menschen die Bühne, die sie verdienen. “Here, old people get the stage they deserve.”) There’s r/notablueberry, where people share images of berries that are not blueberries, which other people often warn them not to eat. Some subreddits exist just to deliver a punch line, like r/Lurkers, a community with more than 41,000 members in which no one posts anything at all. Asking someone where they spend time on Reddit opens a window onto their personality that can be surprisingly intimate. Here, I’ll go: I love r/whatisit, where users share photos of confusing objects they encounter; r/Honolulu, which is a mix of island news and extremely local references; r/tipofmytongue, where people ask for help finding or identifying “un-googleable” songs, movies, books, or other scraps of cultural memory; r/metropolis, dedicated entirely to Fritz Lang’s 1927 film of the same name. There is a subreddit where violinists gently correct one another’s bow holds, a subreddit for rowers where people compare erg scores, and a subreddit for people who are honest-to-God allergic to the cold and trade tips about which antihistamine regimen works best. One subreddit is for people who encounter cookie cutters whose shapes they cannot decipher. The responses reliably entail a mix of sincere sleuthing to find the answer and ridiculously creative and crude joke guesses…”

See also the following subreddits of interest to federal government employees: r/fednews ; r/fired/feds ; r/ThriftSavingsPlan.