I'm not going to install the app, not sure what that blocks me from but not going to do it. and there's really nothing that tells me why I would like to use the

I'm not going to install the app, not sure what that blocks me from but not going to do it. and there's really nothing that tells me why I would like to use the app. I guess reply? or post? the web part seems pretty bare, I can't tell if it's meant to thread, or go longer with infinite scroll, or be a conversation, or just a wall of posts. I don't get the concept based on the website.