在用户墙上发布时设置自定义隐私 - 限制特定用户的发布可见性

I know the basics of how to post a status update, link, etc. from within a Facebook application, thanks to http://developers.facebook.com/docs/guides/canvas/, but I can't figure out whether it's possible to limit the post's visibility to a certain preset list of friends of the user authorizing the post (since the documentation on Facebook's site isn't exactly the best).

Is it possible to post to the user's wall from within my application so that it's only visible to a pre-selected list of friends? I'm mimicking the functionality of Google Plus's "Circles" feature, where the user can have various groups of friends and post to only those group lists.