Forum for site. On screen 1 the user will beable to use the tab navigation to select what forum they want to go to.
They will be able to add a new topic, or select a topic. Each topic will be listed with how many posts its had and the date and time of last post.
Screen 2 the user will see how may people have viewed a post and have replied to it. Also it will have the date and time of last activity.
Screen 3 shows an opened post and the replies, with a button so a user can add their response but only if they're registered to the site.
I've kept the design clean and minimal, using a blue taken from the site and grey colour scheme.