diff --git a/app/helpers/content_viewer_helper.rb b/app/helpers/content_viewer_helper.rb
index 4077617..3b31b3f 100644
--- a/app/helpers/content_viewer_helper.rb
+++ b/app/helpers/content_viewer_helper.rb
@@ -46,4 +46,13 @@ module ContentViewerHelper
     end
   end
 
+  def addthis_facebook_url(article)
+    "http://www.facebook.com/sharer.php?s=100&p[title]=%{title}&p[summary]=%{summary}&p[url]=%{url}&p[images][0]=%{image}" % {
+      :title => CGI.escape(article.title),
+      :url => CGI.escape(url_for(article.url)),
+      :summary => CGI.escape(truncate(strip_tags(article.body.to_s), 300)),
+      :image => CGI.escape(article.body_images_paths.first.to_s)
+    }
+  end
+
 end
diff --git a/app/models/article.rb b/app/models/article.rb
index 5e3e324..56e39cc 100644
--- a/app/models/article.rb
+++ b/app/models/article.rb
@@ -509,6 +509,13 @@ class Article < ActiveRecord::Base
     self.parent && self.parent.accept_uploads?
   end
 
+  def body_images_paths
+    require 'uri'
+    Hpricot(self.body.to_s).search('img[@src]').collect do |i|
+      (self.profile && self.profile.environment) ? URI.join(self.profile.environment.top_url, i.attributes['src']).to_s : i.attributes['src']
+    end
+  end
+
   private
 
   def sanitize_tag_list
diff --git a/app/views/content_viewer/view_page.rhtml b/app/views/content_viewer/view_page.rhtml
index 64bd4b1..7fb307b 100644
--- a/app/views/content_viewer/view_page.rhtml
+++ b/app/views/content_viewer/view_page.rhtml
@@ -38,6 +38,13 @@
 <script type="text/javascript">
   addthis_pub = '<%= escape_javascript( NOOSFERO_CONF['addthis_pub'] ) %>';
   addthis_logo = '<%= escape_javascript( NOOSFERO_CONF['addthis_logo'] ) %>';
+  addthis_config = {
+    services_custom: {
+      name: 'Facebook',
+      url: '<%= addthis_facebook_url(@page) %>',
+      icon: 'http://cache.addthiscdn.com/icons/v1/thumbs/facebook.gif'
+    }
+  };
   addthis_options = '<%= escape_javascript( NOOSFERO_CONF['addthis_options'] ) %>';
 </script>
 <a href="http://www.addthis.com/bookmark.php" id="bt_addThis" target="_blank" onmouseover="return addthis_open(this, '', '[URL]')" onmouseout="addthis_close()" onclick="return addthis_sendto()"><img src="/images/bt-bookmark.gif" width="53" height="16" border="0" alt="" /></a><script type="text/javascript" src="http://s7.addthis.com/js/152/addthis_widget.js"></script>
diff --git a/test/unit/article_test.rb b/test/unit/article_test.rb
index 50fab33..bb31deb 100644
--- a/test/unit/article_test.rb
+++ b/test/unit/article_test.rb
@@ -1526,4 +1526,33 @@ class ArticleTest < Test::Unit::TestCase
     assert_includes Article.find_by_contents('thing'), art2
   end
 
+  should 'get images paths in article body' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = TinyMceArticle.new :profile => @profile
+    a.body = 'Noosfero <img src="http://noosfero.com/test.png" /> test <img src="http://test.com/noosfero.png" />'
+    assert_includes a.body_images_paths, 'http://noosfero.com/test.png'
+    assert_includes a.body_images_paths, 'http://test.com/noosfero.png'
+  end
+
+  should 'get absolute images paths in article body' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = TinyMceArticle.new :profile => @profile
+    a.body = 'Noosfero <img src="test.png" alt="Absolute" /> test <img src="/relative/path.png" />'
+    assert_includes a.body_images_paths, 'http://noosfero.org/test.png'
+    assert_includes a.body_images_paths, 'http://noosfero.org/relative/path.png'
+  end
+
+  should 'return empty if there are no images in article body' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = Event.new :profile => @profile
+    a.body = 'Noosfero test'
+    assert_equal [], a.body_images_paths
+  end
+
+  should 'return empty if body is nil' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = Article.new :profile => @profile
+    assert_equal [], a.body_images_paths
+  end
+
 end
diff --git a/test/unit/content_viewer_helper_test.rb b/test/unit/content_viewer_helper_test.rb
index e3e36ed..f4e89f9 100644
--- a/test/unit/content_viewer_helper_test.rb
+++ b/test/unit/content_viewer_helper_test.rb
@@ -83,6 +83,42 @@ class ContentViewerHelperTest < Test::Unit::TestCase
     assert_no_match /feed/, result
   end
 
+  should 'generate facebook addthis url for article' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    [TextileArticle, Blog, Folder, Gallery, UploadedFile, Forum, Event, TextArticle, TinyMceArticle].each do |model|
+      a = model.new(:name => 'Some title', :body => 'Some text here.', :profile => profile)
+      assert_equal "http://www.facebook.com/sharer.php?s=100&p[title]=Some+title&p[summary]=Some+text+here.&p[url]=http%3A%2F%2Fnoosfero.org%2Fblog_helper_test%2Fsome-title&p[images][0]=", addthis_facebook_url(a)
+    end
+  end
+
+  should 'generate facebook addthis url without body' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = TinyMceArticle.new(:name => 'Test', :body => nil, :profile => profile)
+    assert_equal "http://www.facebook.com/sharer.php?s=100&p[title]=Test&p[summary]=&p[url]=http%3A%2F%2Fnoosfero.org%2Fblog_helper_test%2Ftest&p[images][0]=", addthis_facebook_url(a)
+  end
+
+  should 'generate facebook addthis url without tags in body' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = TinyMceArticle.new(:name => 'Some title', :body => '<p>This <b class="bold">is</b> a test</p>', :profile => profile)
+    assert_equal "http://www.facebook.com/sharer.php?s=100&p[title]=Some+title&p[summary]=This+is+a+test&p[url]=http%3A%2F%2Fnoosfero.org%2Fblog_helper_test%2Fsome-title&p[images][0]=", addthis_facebook_url(a)
+  end
+
+  should 'generate facebook addthis url with truncated body' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = TinyMceArticle.new(:name => 'Some title', :body => 'test' * 76, :profile => profile)
+    assert_equal "http://www.facebook.com/sharer.php?s=100&p[title]=Some+title&p[summary]=#{'test' * 74}t...&p[url]=http%3A%2F%2Fnoosfero.org%2Fblog_helper_test%2Fsome-title&p[images][0]=", addthis_facebook_url(a)
+  end
+
+  should 'generate facebook addthis url for tinymce article with images' do
+    Environment.any_instance.stubs(:default_hostname).returns('noosfero.org')
+    a = TinyMceArticle.new(:name => 'Some title', :body => '<p>This <b class="bold">is</b> a <img src="/images/x.png" />test</p>', :profile => profile)
+    assert_equal "http://www.facebook.com/sharer.php?s=100&p[title]=Some+title&p[summary]=This+is+a+test&p[url]=http%3A%2F%2Fnoosfero.org%2Fblog_helper_test%2Fsome-title&p[images][0]=http%3A%2F%2Fnoosfero.org%2Fimages%2Fx.png", addthis_facebook_url(a)
+  end
+
+  protected
+
+  include ActionView::Helpers::TextHelper
+
 end
 
 def show_date(date)
@@ -96,3 +132,9 @@ def _(text)
 end
 def will_paginate(arg1, arg2)
 end
+def strip_tags(html)
+  html.gsub(/<[^>]+>/, '')
+end
+def url_for(args = {})
+  ['http:/', args[:host], args[:profile], args[:page]].join('/')
+end
--
libgit2 0.21.2