Karnage on Nostr: Little things like an email notification about new content pulls people back into the ...

Little things like an email notification about new content pulls people back into the platform. The book "hooked" describes these as external triggers - sometimes necessary to help form new habits (such as using your product).

What are nostr's external triggers?

When a person posts and leaves, how do we get them to come back?

How do we let them know someone replied? (without them having the habit of checking)?