I think I found the error.
The new feature of JetPack, called Protect, was not allowing the login by your plugin.
When I turned off the protect from jetPack.. I did login using Facebook..
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I saw it
<b>Warning</b>: Missing argument 2 for Jetpack_Protect_Module::log_successful_login() in <b>…/public_html/blog/wp-content/plugins/jetpack/modules/protect.php</b> on line <b>320</b>
{“status”:true,”message”:””}
