your site will run fine even if you have urls that are not https, some browsers will recognise an unsecured connection, but will not block your site or the link.
I did have some issues with facebook JS codes, but I updated the URL to https and now everything runs great.
I am trying to find a permanent solution, where by external urls that are not secured are rewritten behind my SSL certificate, something like this;
http://www.unsecured-url.com
rewritten to
https://www.my-secured-site.com=http://www.unsecured-url.com
Facebook do something similar and all there uploaded media and urls, become secured behind there own ssl. I'm not sure if it is at all possible for oxwall, but I will try to find a solution.