I'm just curious, I see a lot of new users around SE who ask a question and never come back, so what do we (or more specifically, what does the automated system at play) do to encourage ongoing engagement with SE?
I know users are forced to register before asking a question (although admittedly I'm not quite sure what that means, because I feel like I've seen a few questions by users who were marked as unregistered), but how is that utilized?
When someone asks a question that goes on for a few days and accumulates a few high-quality, complete answers, do we reach out to the asker (through email, presumably) to welcome them back to the site and inform them that their question has been answered? Or are they relied upon to personally remember and care to come back? And if so, is there a rep cut-off at any point?
The same question could be applied to comments as well. We all, obviously, get notifications for comments or answers, but how are those presented to someone who doesn't come on every single day?