I spend a lot of time on my university's subreddit, as well as /r/bestofnetflix, /r/howto, and /r/lifeprotips. I'm looking for more of these subreddits that avoid the annoying aspects of the size of the larger subreddits.
I just wish the SFW porn network would implement a minimum resolution policy. Usually, smaller resolution photos are more like snapshots rather than being the unique, extravagant stuff I was hoping to find there when the network started out. Why call it "porn" if it's the same quality I could find anywhere else?
I just started spending way more time on /r/asoiaf (A Song of Ice and Fire). Good discussion and it's not filled with a bunch of memes and image macros. I love the series and enjoy the the theories that people have come up with; both the reasonable ones and the absolutely absurd. There's a great community with a solid shared interest and unlike subs that are based on TV shows, this one has discussion that remains strong even during the off-season. /r/FanTheories and /r/ShittyFanTheories are also pretty good. Or at the very least interesting.
r/depthhub, r/running, r/emoscreamo, r/mildlyinteresting, r/tifu, r/learnuselesstalents