[Plugin: Add Link to Facebook] cURL error 56

it returns an error after I public a post:

Add Link to Facebook – A stockings girl temptation: cURL error 56: Array ( [url] => https://graph.facebook.com/me/feed [content_type] => [http_code] => 0 [header_size] => 0 [request_size] => 498 [filetime] => -1 [ssl_verify_result] => 0 [redirect_count] => 0 [total_time] => 29.51625 [namelookup_time] => 0.000931 [connect_time] => 0.060454 [pretransfer_time] => 0.211731 [size_upload] => 363 [size_download] => 0 [speed_download] => 0 [speed_upload] => 12 [download_content_length] => -1 [upload_content_length] => 363 [starttransfer_time] => 0 [redirect_time] => 0 )

http://ww.wp.xz.cn/extend/plugins/add-link-to-facebook/