I've reviewed your installation and you've too many Facebook extensions. They all are trying to load and prepare the exact same API. This will cause them to conflict. You need to pick 1 and stay with that 1. I've disabled the below Joomla plugins, which has resolved your issue.
System - myApiOpenGraph
System - myApiTabs
System - myApiConnect
Content - myApiSend
Content - myApiOpenGraphContent
Content - myApiComment
Content - myApiShare
Content - myApiLike
Authentication - myApiAuth
User - myApiUser
The above belongs to
extensions.joomla.org/extensions/social-web/facebook-display/11624 which was removed from JED for inappropriate phone home calls. I HIGHLY recommend uninstalling it entirely.