I have an application that allows martial arts trickers to 'battle' each other by initiating challenges and submitting videos and whatnot. When user A challenges user B, the application posts to the user's wall (the one who initiated the challenge).

My question is how do I tag user B in the wall post? It essentially says "challenged John Do to a battle". I'd like "John Do" to link to his profile just like when you manually post something on your wall and use the @ symbol.

I hope this makes sense. I've tried standard html for a link, and I've tried FBML. Neither are parsed and only render as plain text on the wall post.

Thanks for any help!