The rest of my time spent on the internet is either habitual, i.e. Reddit/FB/YouTube for my "entertainment needs", or purpose-driven, i.e. googling relevant information for whatever projects I'm working and so accordingly is largely random.
I want to go to more places like this, and I tried slashdot, but I didn't understand their comment section and am incredibly passive. So here I am.
I think multi-reddits can be great, as you can isolate yourself from the mess of r/all, but unfortunately the comments sections on the subreddits I'm interested in are nowhere near parity with HN. Furthermore, the subreddits carry a lot of noise submissions that I feel aren't as strongly represented on the the front pages of HN.
Oddly, I have found YouTube has taken an increasingly large portion of my internet time. There are a ton of really informative, good quality education videos being pushed onto YT today, for example 3Blue1Brown's math content comes to mind . However, the comments sections for most videos is maybe only millimeters above being worthless at best, and detracting on average.