Oddbean new post about login | logout Nostur has it. I found it as a useful avenue for discoverability. Instead of me searching, somehow others find me. In turn I have the option to follow back. It’s akin to a suggested follow.
listening on every contact list update would be tons of data usage, this is why I've never done it. push notifications would be way more efficient. I'm surprised nostur is doing that without push.
from what I've been able to measure so far most data is still coming from images and video. I guess it may become a problem for very popular accounts but for those it also might not be that interesting anymore to know about new random followers, I will probably limit that to new followers that you already follow (following back)