The world bulletin is, to say the least, primitive. It handles the basics very well—you can post text and images on behalf of your nation or alliance, and others can comment on these posts—but if we want more of the playerbase to use this feature and accept it as part of the game, here are some improvements that could make it more usable:
Following bulletins — Currently, only the original nation that posted the bulletin receives notifications for new activity. But no doubt there are others who are invested in certain bulletins and want a way to stay up to date. There should be an option to follow bulletins of your choice and receive notifications.
Following users — Expanding on this earlier point, maybe certain nations make compelling bulletins are their latest updated are vital. Maybe by default, nations should follow posts by their alliances so it's easier for them to be in the loop.
Replying to comments — Also expanding on this first point, I've noticed when players currently want to address certain comments, they make their own separate comment (usually beginning with @[leader name]) and hope the message is received. Allowing a layer of replies allows players to directly address comments and keep active conversation going.
More reactions — You can currently only "like" bulletins and comments. That's great, but adding more reactions would make things more vibrant. Maybe a "dislike" that counters it so you get a better sense of public perception, for example.
As I write this I realize that a lot of these features are already available on our dear forums, but that's not the point. When I browse the bulletins I realize there's an entirely separate ecosystem in the game, frequented by smaller players who often have no clue how the game works but are enjoying it nonetheless. By enhancing the bulletins feature I'm hoping it will make the game more enjoyable for these folks, but also be a way for us larger folk to try out the feature and bridge this communication gap.