I can't wait to see other hackers' responses! Aside from HN, I have curated multireddits (yeah, I'll be pretty mainstream in this thread). In order to create them according to my needs, I browsed r/DepthHub; investigated the most popular and the least ones; subscribed to the ones I found the most interesting (either because of topic, or how the topic is framed) and then trimmed these copied multis to keep only the the subs that I liked.