Is It Possible To Alter a Facebook Wall Post?

I have recently added support to post to a user's wall in my iPhone Application. However, I was wondering if it's possible to alter the text in a wall post after it has been posted. When I perform the post, I get a response from the server with the post id but it does开发者_如何学Pythonn't look like I can make modifications with it. It looks like the only way to do this is to delete the old post and create a new one. Is that correct?

It is not possible either from UI or API.