Feed notifications would be interesting. Maybe an extra `notify` tag which supporting clients can pick up and alert the user to? I actually really like that.
Discussion
I was thinking of using the usual dot next to the name for a simple and not too intrusive first notice:
Or are you thinking about something more prominent, like a popup/toast?
The dot is an interesting idea, I don't know if I want to load the universe in the background. I was thinking maybe a card in notifications, but your idea is better