diff --git a/controllers/colab_integration_plugin_controller.rb b/controllers/colab_integration_plugin_controller.rb
index 4da18f1..88812bb 100644
--- a/controllers/colab_integration_plugin_controller.rb
+++ b/controllers/colab_integration_plugin_controller.rb
@@ -1,11 +1,20 @@
 class ColabIntegrationPluginController < ApplicationController
   def index
+    timestamp = get_timestamp params[:timestamp]
+
+    profiles = if timestamp
+      environment.profiles.where("updated_at > ?", timestamp)
+    else
+      environment.profiles
+    end
+
     data = {
-      "total" => environment.profiles.count,
+      "timestamp" => Time.zone.now.to_s,
+      "total" => profiles.count,
       "profiles" => []
     }
 
-    environment.profiles.each do |profile|
+    profiles.each do |profile|
       data["profiles"] << profile.attr_to_hash
     end
 
@@ -13,4 +22,14 @@ class ColabIntegrationPluginController < ApplicationController
 
     data.to_json
   end
+
+  private
+
+  def get_timestamp timestamp
+    begin
+      Time.parse timestamp
+    rescue
+      nil
+    end
+  end
 end
diff --git a/test/functional/colab_integration_plugin_controller_test.rb b/test/functional/colab_integration_plugin_controller_test.rb
index de84113..e07c2d2 100644
--- a/test/functional/colab_integration_plugin_controller_test.rb
+++ b/test/functional/colab_integration_plugin_controller_test.rb
@@ -43,6 +43,33 @@ class ColabIntegrationPluginControllerTest < ActionController::TestCase
       person["articles-count"] > 0
     }
     assert_equal persons_with_article.count, 1
+    assert_nothing_raised do
+      Time.parse environment_data["timestamp"]
+    end
+  end
+
+  should "return a json with only the last updated profiles" do
+    time = Time.at 0
+
+    Profile.destroy_all
+
+    kingsland = Community.create!(:name => "Kings Land", :identifier => "kings-land")
+    winterfell = Community.create!(:name => "Winterfell", :identifier => "winterfell")
+
+    get :index, :timestamp => time.to_s
+
+    environment_data = JSON.parse(@response.body)
+
+    assert_equal environment_data["total"], 2
+
+    winterfell.updated_at = time
+    winterfell.save!
+
+    get :index, :timestamp => time.to_s
+
+    environment_data = JSON.parse(@response.body)
+
+    assert_equal environment_data["total"], 1
   end
 
   should "return a hash with activities of the user" do
--
libgit2 0.21.2