Facebook asking for extended permissions (but should not)
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :twitter,  'ABC', 'DEF'
  provider :facebook, 'UVW', 'XYZ'
end

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :twitter,  'ABC', 'DEF'
  provider :facebook, 'UVW', 'XYZ', {:scope => 'email'}
end