Discussion posts order top to bottom, bottom to top ux
I'm working on a discussion board, where users can have discussions in different topics. In the current version, the new message box is in a modal. I'm planning to move it to into the list itself.
Currently, I'm planning to move the to the top, as the new posts appear at the top, and older posts are at the bottom.
If I change the order, as on most of the platforms (forum, discussion boards), where the message form is at the bottom, and latest messages are at the bottom, the users need to scroll down to the bottom. (Or make some trick, to scroll the page to the bottom. But this not makes sense to me..)
What are the best practices, or what are some published case studies about messaging/posts order in different type of online communication?
- Facebook posts are independent from each other, as we see on the wall, they are not belongs to each other, so the "flow" seems fine
- Forums/email threads flow is the older at the top, new at the bottom, where we have the ability to "go through on the topic".
At option 2, my problem is the user has to begin at the oldest post or at leat an older one. When we saw a blog post's comments, its clear, the we can follow the whole discussion, with the beginning.
For a discussion board, however, the users are up to date about what is going on, so an older message isn't related to continue communication with others.
What are some example sites/app, where they break these rules?