OakR said:
The 3rd option seems to get no responses to anything, though I imagine there is some stuff done via PM.
I'm not entirely sure why but the 'Wanted' section doesn't accept replies, only PMs. I've used it a few times and have always received a helpful reply from someone within a day or three.
I admit I (and probably others) should have a look at this section more often as there's quite often something that I can provide help with (eg, window cleaner contact, etc).