Sorry its not really a bug but i have set up recaptcha on ligin which is fin but if someone uses the facebook login they get a different captcha that is to hard can this not use recaptcha as well?
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By the way , our next version ( 2.2.0 ) will support the feature Facebook Login (https://developers.facebook.com/docs/facebook-login/v2.2)
For more information , see : https://developers.facebook.com/docs/plugins/registration/v2.2 .