Hello Stephane Lavoisard
Fixed problem Warning: Please help me find and open file administrator/components/com_joautofacebook/helpers/joautofacebook.php go to line 64 and delete this line
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
Or you can send me joomla administrator via contact form and we will help you fixed it
and when you select the Pages where you want to post K2 Articles and hit Save is it work and save in database and you will see this pages when you create or edit item in k2
(you not see the facebook fan page is choose when you save because value for the page will changed when you save or reload page so we can not checked it and only personal page not changed)
Best regards
Bach Pham