Forum

Forum are good because you can share information with other people, then they can comment on your post, so you know what can be improved or what is awesome.
The advantages about forums are that they can be active even when the own of the forum is not online. Also only people that are signed up to the forum can actually comment on the forum that has been started.
The disadvantages of forums are that if you have a forum which has a lot of comments, there are going to be some comments that are not relevant to the forum, also if you do not stats how long the forum will go on for then the forum could go on for weeks or even month.