I confused 2?

Do I have to wandering around and make a reply to others group's discussion or start a new discussion under a forum category? How friends reach that?
What friends can do that no friends cannot? I prefer to connect with friends by posting on my wall and make a discussion to group of friends same as what I use to do on Fb,but it seems there is no discussion wall for my thoughts and words anywhere to share it with my friends.
I lost , stand at middle of nowhere . Please somebody find me.