diff --git a/.gitignore b/.gitignore
index 0d307089f..05906bf13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,5 @@
 /tmp
 
 /spec/examples.txt
-/config/database.yml
\ No newline at end of file
+/config/database.yml
+/config/secrets.yml
diff --git a/Gemfile b/Gemfile
index 5dfb2f7c5..f2ef657e5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -35,6 +35,7 @@ gem 'acts-as-taggable-on'
 gem "responders"
 gem 'foundation-rails'
 gem 'acts_as_votable'
+gem "recaptcha", :require => "recaptcha/rails"
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
diff --git a/Gemfile.lock b/Gemfile.lock
index 0b070914b..34de0c6d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -137,6 +137,7 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rake (10.4.2)
     rdoc (4.2.0)
+    recaptcha (0.4.0)
     responders (2.1.0)
       railties (>= 4.2.0, < 5)
     rspec-core (3.3.1)
@@ -210,6 +211,7 @@ DEPENDENCIES
   jquery-rails
   pg
   rails (= 4.2.3)
+  recaptcha
   responders
   rspec-rails (~> 3.0)
   sass-rails (~> 5.0)
diff --git a/app/assets/javascripts/comments.js.coffee b/app/assets/javascripts/comments.js.coffee
new file mode 100644
index 000000000..a1635b42c
--- /dev/null
+++ b/app/assets/javascripts/comments.js.coffee
@@ -0,0 +1,9 @@
+jQuery ->
+
+  toggle_comment = (id) ->
+    $("#js-comment-form-#{id}").toggle()
+
+  $('.js-add-comment-link').click ->
+    id = $(this).data().id
+    toggle_comment(id)
+    false
\ No newline at end of file
diff --git a/app/controllers/debates_controller.rb b/app/controllers/debates_controller.rb
index 9ad043bb6..672f41d20 100644
--- a/app/controllers/debates_controller.rb
+++ b/app/controllers/debates_controller.rb
@@ -1,4 +1,5 @@
 class DebatesController < ApplicationController
+  include RecaptchaHelper 
   before_action :set_debate, only: [:show, :edit, :update]
   before_action :authenticate_user!, except: [:show, :index]
   before_action :validate_ownership, only: [:edit, :update]
@@ -24,8 +25,11 @@ class DebatesController < ApplicationController
   def create
     @debate = Debate.new(debate_params)
     @debate.author = current_user
-    @debate.save
-    respond_with @debate
+    if verify_captcha? and @debate.save
+      redirect_to @debate, notice: t('flash.actions.create.notice', resource_name: 'Debate')
+    else
+      render :new
+    end
   end
 
   def update
@@ -47,4 +51,9 @@ class DebatesController < ApplicationController
       raise ActiveRecord::RecordNotFound unless @debate.editable_by?(current_user)
     end
 
+    def verify_captcha?
+      return true unless recaptcha_keys?
+      verify_recaptcha(model: @debate) 
+    end
+
 end
diff --git a/app/helpers/comments_helper.rb b/app/helpers/comments_helper.rb
new file mode 100644
index 000000000..8e8aae90c
--- /dev/null
+++ b/app/helpers/comments_helper.rb
@@ -0,0 +1,11 @@
+module CommentsHelper
+
+  def comment_link_text(parent)
+    parent.class == Debate ? "Comentar" : "Responder"
+  end
+
+  def comment_button_text(parent)
+    parent.class == Debate ? "Publicar comentario" : "Publicar respuesta"
+  end
+
+end
\ No newline at end of file
diff --git a/app/helpers/recaptcha_helper.rb b/app/helpers/recaptcha_helper.rb
new file mode 100644
index 000000000..9e6fa90e6
--- /dev/null
+++ b/app/helpers/recaptcha_helper.rb
@@ -0,0 +1,8 @@
+module RecaptchaHelper
+  
+  def recaptcha_keys?
+    Recaptcha.configuration.public_key.present? && 
+    Recaptcha.configuration.private_key.present?
+  end
+
+end
\ No newline at end of file
diff --git a/app/views/comments/_form.html.erb b/app/views/comments/_form.html.erb
index b309a34ef..4550aa2b4 100644
--- a/app/views/comments/_form.html.erb
+++ b/app/views/comments/_form.html.erb
@@ -1,7 +1,11 @@
-<%= form_for [@debate, Comment.new] do |f| %>
-  <%= f.text_area :body %>
-  <%= f.hidden_field :commentable_type, value: parent.class %>
-  <%= f.hidden_field :commentable_id, value: parent.id %>
-  
-  <%= f.submit 'Publicar comentario', :class => "button radius" %>
-<% end %>
\ No newline at end of file
+<%= link_to comment_link_text(parent), "", class: "js-add-comment-link", data: {'id': parent.id} %>
+
+<div id="js-comment-form-<%= parent.id %>" style="display:none">
+  <%= form_for [@debate, Comment.new] do |f| %>
+    <%= f.text_area :body %>
+    <%= f.hidden_field :commentable_type, value: parent.class %>
+    <%= f.hidden_field :commentable_id, value: parent.id %>
+    
+    <%= f.submit comment_button_text(parent), :class => "button radius" %>
+  <% end %>
+</div>
diff --git a/app/views/debates/_form.html.erb b/app/views/debates/_form.html.erb
index 9d0af3892..df43ab8b0 100644
--- a/app/views/debates/_form.html.erb
+++ b/app/views/debates/_form.html.erb
@@ -30,6 +30,8 @@
     Acepto la política de privacidad y el aviso legal 
   <% end %>
 
+  <%= render 'shared/captcha' %>
+
   <div class="actions">
     <%= f.submit %>
   </div>
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index 9ea4a817f..aa8c240b0 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -5,16 +5,16 @@
         <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 
         <title><%= content_for?(:title) ? yield(:title) : "Participación" %></title>
-
         <%= stylesheet_link_tag    "application" %>
         <%= javascript_include_tag "vendor/modernizr" %>
         <%= javascript_include_tag "application", 'data-turbolinks-track' => true %>
         <%= csrf_meta_tags %>
+        <script src="https://www.google.com/recaptcha/api.js?hl=<%= I18n.locale %>"></script>
     </head>
-<body>
-    
+  <body>
+
     <%= render 'layouts/header' %>
-    
+
     <% if notice %>
         <p class="alert-box success"><%= notice %></p>
     <% end %>
@@ -22,11 +22,11 @@
     <% if alert %>
         <p class="alert-box success"><%= alert %></p>
     <% end %>
-    
+
     <div class="row">
       <div class="small-12 column">
         <%= yield %>
       </div>
-    </div>  
-</body>
+    </div>
+  </body>
 </html>
\ No newline at end of file
diff --git a/app/views/shared/_captcha.html.erb b/app/views/shared/_captcha.html.erb
new file mode 100644
index 000000000..7200bf6da
--- /dev/null
+++ b/app/views/shared/_captcha.html.erb
@@ -0,0 +1,3 @@
+<% if recaptcha_keys?   %>
+  <%= recaptcha_tags ajax: true, hl: I18n.locale %>
+<% end %>
\ No newline at end of file
diff --git a/app/views/shared/_tags.html.erb b/app/views/shared/_tags.html.erb
index 4f41b2a00..645fd2b4f 100644
--- a/app/views/shared/_tags.html.erb
+++ b/app/views/shared/_tags.html.erb
@@ -1,3 +1,3 @@
 <% if debate.tags.any? %>
-  <i class="fi-price-tag"></i> <%= tags(debate) %>
+  <i class="fi-price-tag"></i> <span class='tags'><%= tags(debate) %></span>
 <% end %>
\ No newline at end of file
diff --git a/config/initializers/recaptcha.rb b/config/initializers/recaptcha.rb
new file mode 100644
index 000000000..36a5cef8b
--- /dev/null
+++ b/config/initializers/recaptcha.rb
@@ -0,0 +1,5 @@
+Recaptcha.configure do |config|
+  config.public_key  = Rails.application.secrets.recaptcha_public_key
+  config.private_key = Rails.application.secrets.recaptcha_private_key
+  config.api_version = 'v2'
+end
\ No newline at end of file
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 065395716..d09a8dd09 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -20,4 +20,7 @@
 # available at http://guides.rubyonrails.org/i18n.html.
 
 en:
-  hello: "Hello world"
+  recaptcha:
+  errors:
+    verification_failed: "Incorrect Captcha"
+    recaptcha_unreachable: "Internet connecion error. Could not load Captcha"
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 68f7b4a06..a5666614d 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -195,4 +195,8 @@ es:
       default: "%A, %d de %B de %Y %H:%M:%S %z"
       long: "%d de %B de %Y %H:%M"
       short: "%d de %b %H:%M"
-    pm: pm
\ No newline at end of file
+    pm: pm
+  recaptcha:
+    errors:
+      verification_failed: "El Captcha no es correcto"
+      recaptcha_unreachable: "Fallo de conexión a Internet. No se ha podido cargar el Captcha"
\ No newline at end of file
diff --git a/config/secrets.yml b/config/secrets.yml.example
similarity index 81%
rename from config/secrets.yml
rename to config/secrets.yml.example
index 1badccfe5..7fc628887 100644
--- a/config/secrets.yml
+++ b/config/secrets.yml.example
@@ -10,13 +10,18 @@
 # Make sure the secrets in this file are kept private
 # if you're sharing your code publicly.
 
+default: &default
+  recaptcha_public_key: <%= ENV["MADRID_RECAPTCHA_PUBLIC_KEY"] %>
+  recaptcha_private_key: <%= ENV["MADRID_RECAPTCHA_PRIVATE_KEY"] %>
+
 development:
   secret_key_base: 56792feef405a59b18ea7db57b4777e855103882b926413d4afdfb8c0ea8aa86ea6649da4e729c5f5ae324c0ab9338f789174cf48c544173bc18fdc3b14262e4
+  <<: *default
 
 test:
   secret_key_base: 4d5adf961ddd27aef19622d6c0b3234d555f9ee003f022b1f829c92bbe33aaee907be7feb67bd54c14a1a32512fa968565ad405971fbc41bd0797af73c26a796
+  <<: *default
 
-# Do not keep production secrets in the repository,
-# instead read values from the environment.
 production:
   secret_key_base: <%= ENV["SECRET_KEY_BASE"] %>
+  <<: *default
\ No newline at end of file
diff --git a/spec/features/tags_spec.rb b/spec/features/tags_spec.rb
index 06d5c1391..27b2528bd 100644
--- a/spec/features/tags_spec.rb
+++ b/spec/features/tags_spec.rb
@@ -82,7 +82,10 @@ feature 'Tags' do
     click_button 'Actualizar Debate'
 
     expect(page).to have_content 'Debate actualizado correctamente'
-    expect(page).to have_content 'Economía, Hacienda'
+    within('.tags') do
+      expect(page).to have_css('a', text: 'Economía')
+      expect(page).to have_css('a', text: 'Hacienda')
+    end
   end
 
   scenario 'Delete' do
diff --git a/spec/helpers/recaptcha_helper_spec.rb b/spec/helpers/recaptcha_helper_spec.rb
new file mode 100644
index 000000000..545e9e827
--- /dev/null
+++ b/spec/helpers/recaptcha_helper_spec.rb
@@ -0,0 +1,22 @@
+require 'rails_helper'
+
+describe RecaptchaHelper do
+
+  describe "#recaptcha_keys?" do
+
+    it "should be true if Recaptcha keys are configured" do
+      allow(Recaptcha.configuration).to receive(:public_key).and_return("akjasf")
+      allow(Recaptcha.configuration).to receive(:private_key).and_return("akjasf4532")
+
+      expect(helper.recaptcha_keys?).to be true
+    end
+
+    it "should be false if Recaptcha keys are not configured" do
+      allow(Recaptcha.configuration).to receive(:public_key).and_return(nil)
+      allow(Recaptcha.configuration).to receive(:private_key).and_return(nil)
+
+      expect(helper.recaptcha_keys?).to be false
+    end
+
+  end
+end