Facebook has posted a note indicating that administrators can target individual wall posts to subsets of viewers.
Here’s what Facebook says about this capability:
Did you know you can target your Facebook posts by location and language using your page? Try it by clicking on the drop-down next to “share” and then customizing the target of the post. You can be as broad as a country and all languages or as targeted as specific language speakers in a city of your choice. Only those that meet the target will see it in their news feed.
Readers, what sorts of wall posts would you want to target to different viewers of your wall?