Sorry, I totally misunderstood how Facebook and Wordbooker work.
Also, I didn't know what I wanted, but now I do.
I want to post the article (complete, so the Excerpt has to be set to the largest value) with the post thumbnail as picture to Facebook. At the end of the post there should be a text like "Article on the blog: [link]".
So I looked at the source code. There is a
function wordbooker_photo_post but it seems like it is not used.
I guess that the code to activate it has to be placed in wordbooker_process_functions.php as
case 5 at about line 450. Next, there is a need of implement a
$posting_target['target_type'] = 5 in the UI.
Do you already have coded that? Or should I do it myself?