Your site is not allowing itself to be loaded within an iFrame. Within Facebook, if you view the "Developer Console", the following error message display:
Refused to display 'www.clarenceling.com/' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'.
You'll need to change your firewall or Cloudflare settings to not send that header which explicitly tells the browser *not* to allow your page to be shown in an iFrame.
I hope that helps,
Alex
Facebook Page Tab & Canvas Not Working
