Can you please check if the App on your Facebook dashboard is properly set up? Now it renders an empty box.
Check if the "Settings -> App Domains" has "www.samfx.com"
The "Website -> Site URL" is "http://www.samfx.com/"
"App review -> Make appName public?" is ON
This is not a real error - Chrome developer tools is missing the original uncompressed CSS file (mapping) - it does not related to the normal working. I have no idea why though, because for me Chrome simply displays the compressed CSS without any complaint.
Problem is solved!
I think I got new problem but at this time with Instagram plugin, can you check my homepage samfx.com ? Is it same like at my screenshot? It looks like the same problem what happened with Facebook plugin.