Sharing message doesn't show content parts

Remco_Vermeer

We are using the sharing message api to publish to a single social media network on behalf of the users identity token.

We run into the following problems:
- facebook: the picture is not in the message, the link is.. but the link info (caption, description etc) is not
- twitter: the picture and the link are not in the message, so it's text only

Also when we try to delete a published message the api returns success but the message is still on the users social media account.

How can this be fixed?