This is the minimum requirements that worked for me, to use facebook connect from ionic / cordova.
Big thanks for @luschn for guidance and assistant to debug it properly.
<meta http-equiv="Content-Security-Policy"
content="style-src 'self' 'unsafe-inline';
script-src 'self' 'unsafe-inline' 'unsafe-eval'
http://localhost https://connect.facebook.net;
connect-src 'self'
https://*.mydomain.com <!-- Replace with your own
domain-->
https://*.facebook.net ws: wss:;
">
solved Whats the most restricted Content-Security-Policy to enable facebook connect