Check if your server can connect to Facebook
Sends a https request to Facebook to detect possible connection errors. Expects a code 400 / Bad request response.
There seems to be a problem
Try enabling the compatibility options of the plugin
[errors] => Array
[http_request_failed] => Array
 => error setting certificate verify locations:
[error_data] => Array
Check if the SSL module is loaded
Facebook requires secure https transmissions. Therefore your webserver has to support SSL. Not all hoster, especially freehoster, offer this service.
Everything looks fine