Facebook Graph Post link problems

I'm trying to post a link to the wall of a facebook Page through the graph api. http://developers.facebook.com/docs/reference/api/post/

Unfortunately the api is not very well documentet so i have some problems:

• How do i get the "Share开发者_如何学Go"-action to appear under a link i've posted?
• How can i disable thumbnails for the link?
• How can i make the caption linked

All those works when posting manually but i havn't found a way to do it through the api. I know it's possible though since i've seen other apps do it.