OOC - How do you balance a post?

When writing a post for your game, how do you prefer to balance the post with moving the story forward and focusing on character relations and describing the scene?

Of course, all three are important but it can be easy to become too focused on the details and leave the plot hanging. At the same time, you don't want to be a plot-hog and not give anyone else a chance at adding their bit to the story.

What's your technique as a writer? And game mods, what's your prefered policy for your games?