SEO Facebook Comment Fatal Error

It’s because your server takes longer than expected to retrieve an internet resource, perhaps from the facebook server? If you look in the referenced file, somewhere above line 825, the code should define some curl settings. You will want to set CURLOPT_CONNECTTIMEOUT to something a fair bit longer than what’s there.

If it’s not defined, you may have to add a line defining it. Check out php.net for full info on curl options.