The problem with Facebook is that nothing is archived. If I don't log into this forum for a few days, I can come and see everything I have missed easily. If I miss a post on FB. After a few days or even hours I may never see it. Having a tournament announcement that I can go back to anytime to reference points, restrictions, and rules is very useful. It is tedious to have to search through a feed every time. Buy/sell/trade is the same situation. It's nice to see what people have for sale all in one place and not have to hunt through a news feed to see if any new posts were made or to find one you saw earlier.