Drupal Technical
[SOLVED][Drupal Facebook Rules][Drupal Facebook OAuth] Facebook Rules prevents FBOAuth from capturing e-mail address
Some Drupal users have realized that Facebook Rules prevents FBOAuth from capturing e-mail addresses in their Drupal website. Uninstalling Facebook Rules brings back the functionality to FBOAuth. If you are encountering a similar issue in your Drupal website then read on to find out more.
Install the patch to solve the issue. http://drupal.org/files/facebook_rules-email_import-1536358.patch.
Hope that helps.
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Reference: http://drupal.org/node/1536358