I wasn't ablt to submit my digg post so i contacted them. their reply was Hi - The URL you're trying to submit seems to be failing a CURL check. Visit http://www.php.net/curl for additional information. Thank you, ---Digg Support Code (markup): What should i do?
Had a same problem some time ago (submit error for wmtips.com), and it was resolved: http://forums.digitalpoint.com/showthread.php?t=723895 Haven't checked it for some time, maybe it's broken again.