For email, I apply a fairly strict GTD of Inbox Zero approach. That works less well for Mastodon (maybe other fediverse clients), Twitter, and SSB (at least with Patchwork), where the UI is an infinite stream of new messages, and no easy way to see what's new since you last read through all messages. Not sure how to think about that.
IRC has the same issue, but for some reason I don't much mind it there. Maybe I'm just used to IRC by now.