diff --git a/app/controllers/services_controller.rb b/app/controllers/services_controller.rb
index ff6e518f..4d5c063d 100644
--- a/app/controllers/services_controller.rb
+++ b/app/controllers/services_controller.rb
@@ -30,7 +30,7 @@ class ServicesController < ApplicationController
 
   def update
     service = current_user.services.find(params[:id])
-    service.post_tag = params[:service][:post_tag]
+    service.post_tag = params[:service][:post_tag].gsub('@', '')
     if service.save
       flash[:success] = "Service updated successfully"
     else
diff --git a/app/views/settings/_services.haml b/app/views/settings/_services.haml
index 0cc23b84..24087517 100644
--- a/app/views/settings/_services.haml
+++ b/app/views/settings/_services.haml
@@ -24,5 +24,5 @@
           .col-md-6.mt-2
             = bootstrap_form_for(service, as: 'service', url: update_service_path(service)) do |f|
               = f.text_field :post_tag, class: 'form-control', label: 'tag', label_as_placeholder: true,
-                append: f.submit('Update', class: 'btn btn-primary'), maxlength: 20,
+                append: f.submit('Update', class: 'btn btn-primary'), maxlength: 20, pattern: '^[^@]*$',
                 help: "Automatically append a tag to your shared answers. #{'A # symbol is not automatically prepended.' if service.provider == 'twitter'}"