It would be awesome of we had a way to unsubscribe from notifications generated by a specific user. It could use the same UI as the unsubscribe option on tasks. Simply an unsubscribe button on user profiles. I really don’t know how difficult this would be to implement, though I suspect it might be difficult. I might try my hand at implementing this in Wikimedia’s fork of Phabricator, however, I thought I’d post the idea here to gauge interest and see if upstream has any opinion on the matter.