Pregnancy related.
Have been on mumsnet for a while now and something I've noticed had really begun to to grind my gears. People posting in the wrong/inappropriate forums. For example, IMO questions like "am I pregnant" or "thinking about starting a family" belong in the preconception board not pregnancy. Likewise, posts about abortion and losses have their appropriate boards. (I only mention this as I was a paranoid, nervous wreck at the start of my pregnancy because of all the negative posts.) and again posts about labour/delivery should be in the childbirth board. Again, just my opinion, but it really annoys me.