diff --git a/CHANGELOG b/CHANGELOG
index 59e3e22..305e2c5 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -8,6 +8,7 @@ v 6.8.0
   - Create branches via API (sponsored by O'Reilly Media)
   - Changed permission of gitlab-satellites directory not to be world accessible
   - Protected branch does not allow force push
+  - Allow oauth signup without email for twitter and github
 
 v 6.7.3
   - Fix the merge notification email not being sent (Pierre de La Morinerie)
diff --git a/lib/gitlab/oauth/user.rb b/lib/gitlab/oauth/user.rb
index 65d6920..94a76f1 100644
--- a/lib/gitlab/oauth/user.rb
+++ b/lib/gitlab/oauth/user.rb
@@ -30,12 +30,18 @@ module Gitlab
           user = model.build_user(opts, as: :admin)
           user.skip_confirmation!
 
+          # Services like twitter and github does not return email via oauth
+          # In this case we generate temporary email and force user to fill it later
           if user.email.blank?
             user.generate_tmp_oauth_email
+            user.save!(validate: false)
+          else
+            # Google oauth returns email but dont return nickname
+            # So we use part of email as username for new user
+            user.username = email.match(/^[^@]*/)[0]
+            user.save
           end
 
-          user.save!(validate: false)
-
           log.info "(OAuth) Creating user #{email} from login with extern_uid => #{uid}"
 
           if Gitlab.config.omniauth['block_auto_created_users'] && !ldap?
--
libgit2 0.21.2