Our server has a lot of people, but only a handful are actually regularly active, so come and join us
I personally use 17Shard discord for only social talks, as I don't really care that much about Cosmere theories and book discussions. It's great place to just hang out with friends, talk some nonsense, have some laugh or basically talk about whatever you want. As I said, I mainly frequent the social channels, but there is a bunch of book related ones, where is a lot happening.
The only downside of Discord is that it's sometimes hard to catch up after the night with what was discussed. Especially since during my night most of the Americans are active and chatty.
Before Discord I was really active on the social part of the forums and now I'm basically only hanging out on Discord. So to me, it's just an event better place to talk about whatever with the Sharders