I have actually fixed this issue. The problem was with the facebook connect URL in the FB connect and FB contact importer plugins. Google chrome was blocking the plugin URL as it was not in the format HTTPS.
By changing the URL to https://connect.facebook.net/en_US/all.js. in both plugins, I was able to stop chrome blocking the link. oxwall.org doesn't have this issue as it doesn't run https.
Unfortunately not all websites run https, the SSL certificate of a website only covers content on that websites server, external links such as the FB connect link or thumbnail images from YouTube do not use https and are seen as unsecured data by web browsers. Not all content is blocked, but can however display your site as unsecure.
My site displays that is has an SSL certificate and works fine on HTTPS, but I have a small orange triangle over the Padlock which shows that some content may not be safe.
When a site is fully secured the padlock will display green.
I now want to try and find out how I can get external links like youtube vids to work with HTTPS in oxwall. Maybe you have an idea?