amusedInfertility stuff is friends-locked, but not in a custom group (although I suppose by rights it should be. Oh well. Too late now.)
Pregnancy stuff (when appropriate) is in a custom group. If you want to be added, feel free to comment to this post saying that you want to be added to the Pregnancy group.
Truly depressing, rambly rants are in a custom group. If you want to be added, feel free to comment to this post saying you want to be added to the Futility group.
All women are automatically added to the Girls custom group, but I don't think I use it anymore, and I'm not quite sure why I created it, so forget I mentioned it.
Edited to add: It's funny because when I was journalling with someone who was doing a friendlist cull, I mentioned he should follow it up with a friends-locked post so people would know if they were culled or not and then 2 days later, I post this without custom groups right behind it to verify. I've now added a post to each custom group. You should see it. It should, I hope, be obvious.