I'm having problem with this plug-in by MailChimp - http://wordpress.org/extend/plugins/social/
Sign-in with Facebook/Twitter button takes me to the 404 or Homepage. It should give a pop-up displaying the sign-in page of Twitter/Facebook.
Also I can't connect my account on the setting page of the Social plug-in
Yu can check it below any post on http://nothingwired.com