@hrefna
The examples you list sound good--I hadn't considered limiting notifications before. (Probably because I turn off all real-time notifications.) I like extra clicks (like a USEFUL CW--I disable them because almost all are just annoying).
I can't quite picture a reasonable UI for blocks affecting others in my social network (other than a shared blocklist). I am slowly working on ideas for score-based ranking of notifications and replies, but only with local data.
1/x