diff --git a/app/javascript/styles/components/_notifications.scss b/app/javascript/styles/components/_notifications.scss
index 9ab69bc3..07ce4e23 100644
--- a/app/javascript/styles/components/_notifications.scss
+++ b/app/javascript/styles/components/_notifications.scss
@@ -8,6 +8,7 @@
   &__user,
   &__text {
     margin-bottom: 0;
+    white-space: normal;
   }
 
   &__icon {
@@ -36,7 +37,7 @@
   &-dropdown {
     min-width: 400px;
 
-    & .dropdown-item:hover, 
+    & .dropdown-item:hover,
     & .dropdown-item:active {
       background: transparent;
       color: RGB(var(--body-text));
@@ -55,4 +56,4 @@
       margin-bottom: 0;
     }
   }
-}
\ No newline at end of file
+}
diff --git a/app/models/notification/service_token_expired.rb b/app/models/notification/service_token_expired.rb
new file mode 100644
index 00000000..bc61a820
--- /dev/null
+++ b/app/models/notification/service_token_expired.rb
@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+class Notification::ServiceTokenExpired < Notification
+end
diff --git a/app/models/notification/twitter_token_expired.rb b/app/models/notification/twitter_token_expired.rb
new file mode 100644
index 00000000..9ddb8447
--- /dev/null
+++ b/app/models/notification/twitter_token_expired.rb
@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+class Notification::TwitterTokenExpired < Notification::ServiceTokenExpired
+end
diff --git a/app/models/user/expired_service_connection.rb b/app/models/user/expired_service_connection.rb
new file mode 100644
index 00000000..110dd896
--- /dev/null
+++ b/app/models/user/expired_service_connection.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+# stub model for notifying about expired service connections
+class User::ExpiredServiceConnection < User
+end
diff --git a/app/models/user/expired_twitter_service_connection.rb b/app/models/user/expired_twitter_service_connection.rb
new file mode 100644
index 00000000..bb39250e
--- /dev/null
+++ b/app/models/user/expired_twitter_service_connection.rb
@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+class User::ExpiredTwitterServiceConnection < User::ExpiredServiceConnection
+end
diff --git a/app/views/notifications/type/_expiredtwitterserviceconnection.html.haml b/app/views/notifications/type/_expiredtwitterserviceconnection.html.haml
new file mode 100644
index 00000000..36014390
--- /dev/null
+++ b/app/views/notifications/type/_expiredtwitterserviceconnection.html.haml
@@ -0,0 +1,8 @@
+.media.notification
+  .notification__icon
+    %i.fa.fa-2x.fa-fw.fa-twitter
+  .media-body
+    %h6.media-heading.notification__user
+      = t(".heading")
+    .notification__text
+      = t(".text_html", settings_sharing: link_to(t(".settings_services"), services_path))
diff --git a/app/workers/share_worker.rb b/app/workers/share_worker.rb
index 9f4ebd15..2709c074 100644
--- a/app/workers/share_worker.rb
+++ b/app/workers/share_worker.rb
@@ -9,8 +9,7 @@ class ShareWorker
   # @param answer_id [Integer] the user id
   # @param service [String] the service to post to
   def perform(user_id, answer_id, service)
-    service_type = "Services::#{service.camelize}"
-    user_service = User.find(user_id).services.find_by(type: service_type)
+    user_service = find_service(user_id, service)
 
     user_service.post(Answer.find(answer_id))
   rescue ActiveRecord::RecordNotFound
@@ -23,11 +22,21 @@ class ShareWorker
     logger.info "Tried to post answer ##{answer_id} from user ##{user_id} to Twitter but the account is suspended."
   rescue Twitter::Error::Unauthorized
     # User's Twitter token has expired or been revoked
-    # TODO: Notify user if this happens (https://github.com/Retrospring/retrospring/issues/123)
     logger.info "Tried to post answer ##{answer_id} from user ##{user_id} to Twitter but the token has exired or been revoked."
+    user_service = find_service(user_id, service)
+    user_service.destroy
+
+    Object.const_get("Notification::ServiceTokenExpired").create(
+      target_id:    user_id,
+      target_type:  "User::Expired#{service.camelize}ServiceConnection",
+      recipient_id: user_id,
+      new:          true
+    )
   rescue => e
     logger.info "failed to post answer #{answer_id} to #{service} for user #{user_id}: #{e.message}"
     Sentry.capture_exception(e)
     raise
   end
+
+  def find_service(user_id, service) = User.find(user_id).services.find_by(type: "Services::#{service.camelize}")
 end
diff --git a/config/locales/views.en.yml b/config/locales/views.en.yml
index ad5532c3..7d427b81 100644
--- a/config/locales/views.en.yml
+++ b/config/locales/views.en.yml
@@ -352,6 +352,10 @@ en:
           link_text: "your comment"
       follow:
         heading_html: "followed you %{time} ago"
+      expiredtwitterserviceconnection:
+        heading: "Twitter connection expired"
+        text_html: "If you would like to continue automatically sharing your answers to Twitter, head to %{settings_sharing} and re-connect your account."
+        settings_services: "Sharing Settings"
   services:
     index:
       title: "Service Settings"
diff --git a/spec/workers/share_worker_spec.rb b/spec/workers/share_worker_spec.rb
index e9c6d23e..b98337e3 100644
--- a/spec/workers/share_worker_spec.rb
+++ b/spec/workers/share_worker_spec.rb
@@ -59,6 +59,18 @@ describe ShareWorker do
         expect(Sidekiq.logger).to have_received(:info).with("Tried to post answer ##{answer.id} from user ##{user.id} to Twitter but the token has exired or been revoked.")
       end
 
+      it "revokes the service connection when Twitter::Error::Unauthorized is raised" do
+        allow_any_instance_of(Services::Twitter).to receive(:post).with(answer).and_raise(Twitter::Error::Unauthorized)
+        subject
+        expect { ShareWorker.drain }.to change { Services::Twitter.count }.by(-1)
+      end
+
+      it "sends the user a notification when Twitter::Error::Unauthorized is raised" do
+        allow_any_instance_of(Services::Twitter).to receive(:post).with(answer).and_raise(Twitter::Error::Unauthorized)
+        subject
+        expect { ShareWorker.drain }.to change { Notification::ServiceTokenExpired.count }.by(1)
+      end
+
       it "handles Twitter::Error::Forbidden" do
         allow_any_instance_of(Services::Twitter).to receive(:post).with(answer).and_raise(Twitter::Error::Forbidden)
         subject