On Facebook, users can send personal messages or post notes, images or videos to another user's wall. The wall is there for all to see, while messages are between the sender and the receiver, just like an e-mail. Personal and private matters should never be shared on your wall. You wouldn't go around with a bullhorn announcing a private issue to the world, and the same thing goes on the Internet. This falls under the nebulous world of social networking etiquette. There is no official handbook for this sort of thing, but use your best judgment. If it's not something you'd feel comfortable sharing in person with extended family, acquaintances, work colleagues or strangers, then you shouldn't share it on your Facebook wall.
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