I agree with all of these answers. I try to comment on every recipe I make, partly for myself and to pass along information to others about the recipe. I include any variations I've made, problems I've come across, etc. I usually find recipes through ingredient searches, but I always read previous comments before going ahead. I also make "private" comments for myself - usually things like "Made for Jane's 50th birthday party. Whole family liked it except Uncle George" - nobody else cares, but it helps me remember if I want to make it again. I love that I can edit my comments later too.
I would like some way to provide feedback on comments too ...
Keep up the good work everyone!