Facebook needs the CURL PHP extension.
#0 /srv/http/promodefi.be/www/library/Zend/Loader.php(146): include_once()
#1 /srv/http/promodefi.be/www/library/Zend/Loader.php(94): Zend_Loader::loadFile('Facebook/Sdk.ph...', NULL, true)
#2 [internal function]: Zend_Loader::loadClass('Facebook_Sdk')
#3 /srv/http/promodefi.be/www/library/Zend/Loader/Autoloader.php(479): call_user_func(Array, 'Facebook_Sdk')
#4 [internal function]: Zend_Loader_Autoloader->_autoload('Facebook_Sdk')
#5 /srv/http/promodefi.be/www/library/Zend/Loader/Autoloader.php(124): call_user_func(Array, 'Facebook_Sdk')
#6 [internal function]: Zend_Loader_Autoloader::autoload('Facebook_Sdk')
#7 /srv/http/promodefi.be/www/library/PDW/Application/Resource/Facebook.php(48): spl_autoload_call('Facebook_Sdk')
#8 /srv/http/promodefi.be/www/library/PDW/Application/Resource/Facebook.php(30): PDW_Application_Resource_Facebook->getFacebook()
#9 /srv/http/promodefi.be/www/library/PDW/Application/Bootstrap/Bootstrap.php(547): PDW_Application_Resource_Facebook->init()
#10 /srv/http/promodefi.be/www/library/Zend/Application/Bootstrap/BootstrapAbstract.php(667): PDW_Application_Bootstrap_Bootstrap->_initFacebook()
#11 /srv/http/promodefi.be/www/library/Zend/Application/Bootstrap/BootstrapAbstract.php(620): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('facebook')
#12 /srv/http/promodefi.be/www/library/Zend/Application/Bootstrap/BootstrapAbstract.php(584): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap(NULL)
#13 /srv/http/promodefi.be/www/library/Zend/Application.php(355): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap(NULL)
#14 /srv/http/promodefi.be/www/htdocs/index.php(52): Zend_Application->bootstrap()
#15 {main}