All Jira Projects have independently single bulletin board only for project members permitted.
All project members within a project can add new post and comment, and also view all posts, but not able to edit and delete for the posts that other members added.
Not permitted users for the project cannot visit and view any posts in bulletin board.
Project administrator can manage the bulletin board and register any post to Notice (Pin to Top).
Only Project administrator, System Administrator can delete all posts in the project bulletin board in order to remove useless posts like degrading or speaking ill of others or incorrect news, information.
In the post, any project member can input any articles and opinion including photos and links from the external.
The max size of each posts is 2 MB(re-adjustable to 10MB) and once exceeded the size in a post, not able to save with notice.