I've just sent this to the LJ abuse team, let's see how they respond. Hopefully they give some feedback to Livejournal's upper echelons:
I regard the nudge feature livejournal now incorporates as an invasion of user's privacy. I don't feel that I have any inherent right to know why someone else isn't posting, or vice versa.
Some users may not wish others with access to their email to know that they have livejournal accounts. They may now receive unanted "nudges" from you. This situation could easily arise if someone was using a livejournal anonymously to obtain advice on an abusive parent with access to their email account, or to discuss matters which a spouse or employer might object to.
Since it doesn't work properly anyway (when I looked at it today I saw that it was reporting at least one person who has commented on my journal today as a non-poster) I would strongly urge that it should be scrapped.