The first one was `r/nsfw` apparently. Followed by `r/programming` and `r/politics`.  Originally subs were motivated by subjects dominating the front page. [^1]

[^1]: https://qr.ae/pyAlhQ

k00b

searched for a list of the top 50 subreddits and was surprised how unappealing most of those were...

Or just ~tech in general? I think most people aren't interested in programming but may be in tech related stuff (which includes programming)

Daily discussion thread

saloon

I agree, a ~programming sub seems like the most obvious target right now.

Footnotes