OpenStars

Hrmmm… at a (strong) guess, PieFed does. You can follow anything, like a community, post, comment (even ones you do not own), or a user account. You would get Notifications triggered every time they post something, I believe. Including comments as well as posts, but again just a guess.

It’s a great way to follow a low-volume something or other! At higher volumes… it can get a bit much, but at least the tools are available, and you can always wipe all Notifications at once if need be.

John Oliver fans are the perfect candidates to join the fediverse, hopefully some of them find their way to Lemmy.

Too late - we are already here!:-P