It appears that the cronjobs aren't working either, and if you disable wp-cron jobs and enable manual cronjobs, social broadcasting will begin to work. However the entire crontab doesn't, whether you set it up manually, visit the page or leave it in wp-cron it just plain out does not work.
If I wget I recieve a 500 internal server error.
"wget http://xnite.org/index.php?social_controller=cron&social_action=cron_15&api_key=MYAPIKEY -O -"
Resolving xnite.org (xnite.org)... 18.104.22.168, 22.214.171.124, 2400:cb00:2048:1::c71b:87e0, ...
Connecting to xnite.org (xnite.org)|126.96.36.199|:80... connected.
HTTP request sent, awaiting response... 500 Internal Server Error
2013-04-28 01:25:40 ERROR 500: Internal Server Error.
UPDATE: Manual cron will work, because of the &'s in the URL you will need to put the url inside of singular quotations so that your machine does not think you want it to run the rest of the url as a new command. <i>my bad</i>.
If you disable wp-cron and enable manual cron, then setup a system crontab to visit the page it tells you with wget, all components of social should be fixed :).