diff --git a/app/models/budget/investment.rb b/app/models/budget/investment.rb
index bd3e5b466..173a7fd36 100644
--- a/app/models/budget/investment.rb
+++ b/app/models/budget/investment.rb
@@ -17,6 +17,7 @@ class Budget
     acts_as_votable
     acts_as_paranoid column: :hidden_at
     include ActsAsParanoidAliases
+    include Relationable
 
     belongs_to :author, -> { with_hidden }, class_name: 'User', foreign_key: 'author_id'
     belongs_to :heading
diff --git a/app/models/concerns/relationable.rb b/app/models/concerns/relationable.rb
new file mode 100644
index 000000000..26f755f03
--- /dev/null
+++ b/app/models/concerns/relationable.rb
@@ -0,0 +1,23 @@
+module Relationable
+  extend ActiveSupport::Concern
+
+  included do
+    has_many :related_contents, as: :parent_relationable, dependent: :destroy
+  end
+
+  def relate_content(relationable)
+    RelatedContent.find_or_create_by(parent_relationable: self, child_relationable: relationable)
+  end
+
+  def relationed_contents
+    related_contents.not_hidden.map { |related_content| related_content.child_relationable }
+  end
+
+  def report_related_content(relationable)
+    related_content = related_contents.find_by(child_relationable: relationable)
+    if related_content.present?
+      related_content.increment!(:times_reported)
+      related_content.opposite_related_content.increment!(:times_reported)
+    end
+  end
+end
diff --git a/app/models/debate.rb b/app/models/debate.rb
index 65c06345d..e949e8092 100644
--- a/app/models/debate.rb
+++ b/app/models/debate.rb
@@ -9,6 +9,7 @@ class Debate < ActiveRecord::Base
   include Filterable
   include HasPublicAuthor
   include Graphqlable
+  include Relationable
 
   acts_as_votable
   acts_as_paranoid column: :hidden_at
diff --git a/app/models/proposal.rb b/app/models/proposal.rb
index 3b0696d26..aaf5bea87 100644
--- a/app/models/proposal.rb
+++ b/app/models/proposal.rb
@@ -17,6 +17,7 @@ class Proposal < ActiveRecord::Base
                max_file_size: 3.megabytes,
                accepted_content_types: [ "application/pdf" ]
   include EmbedVideosHelper
+  include Relationable
 
   acts_as_votable
   acts_as_paranoid column: :hidden_at
diff --git a/app/models/related_content.rb b/app/models/related_content.rb
new file mode 100644
index 000000000..ab72aefe3
--- /dev/null
+++ b/app/models/related_content.rb
@@ -0,0 +1,33 @@
+class RelatedContent < ActiveRecord::Base
+  RELATED_CONTENTS_REPORT_THRESHOLD = Setting['related_contents_report_threshold'].to_i
+
+  belongs_to :parent_relationable, polymorphic: true
+  belongs_to :child_relationable, polymorphic: true
+  has_one :opposite_related_content, class_name: 'RelatedContent', foreign_key: :related_content_id
+
+  validates :parent_relationable_id, presence: true
+  validates :parent_relationable_type, presence: true
+  validates :child_relationable_id, presence: true
+  validates :child_relationable_type, presence: true
+  validates :parent_relationable_id, uniqueness: { scope: [:parent_relationable_type, :child_relationable_id, :child_relationable_type] }
+
+  after_create :create_opposite_related_content, unless: proc { opposite_related_content.present? }
+  after_destroy :destroy_opposite_related_content, if: proc { opposite_related_content.present? }
+
+  scope :not_hidden, -> { where('times_reported <= ?', RELATED_CONTENTS_REPORT_THRESHOLD) }
+
+  def hidden_by_reports?
+    times_reported > RELATED_CONTENTS_REPORT_THRESHOLD
+  end
+
+  private
+
+  def create_opposite_related_content
+    related_content = RelatedContent.create!(opposite_related_content: self, parent_relationable: child_relationable, child_relationable: parent_relationable)
+    self.opposite_related_content = related_content
+  end
+
+  def destroy_opposite_related_content
+    opposite_related_content.destroy
+  end
+end
diff --git a/db/dev_seeds.rb b/db/dev_seeds.rb
index a6e471d98..8476f7693 100644
--- a/db/dev_seeds.rb
+++ b/db/dev_seeds.rb
@@ -65,6 +65,7 @@ section "Creating Settings" do
   Setting.create(key: 'map_latitude', value: 51.48)
   Setting.create(key: 'map_longitude', value: 0.0)
   Setting.create(key: 'map_zoom', value: 10)
+  Setting.create(key: 'related_contents_report_threshold', value: 2)
 end
 
 section "Creating Geozones" do
diff --git a/db/migrate/20171127171925_create_related_content.rb b/db/migrate/20171127171925_create_related_content.rb
new file mode 100644
index 000000000..2944938e2
--- /dev/null
+++ b/db/migrate/20171127171925_create_related_content.rb
@@ -0,0 +1,12 @@
+class CreateRelatedContent < ActiveRecord::Migration
+  def change
+    create_table :related_contents do |t|
+      t.references :parent_relationable, polymorphic: true, index: { name: 'index_related_contents_on_parent_relationable' }
+      t.references :child_relationable, polymorphic: true, index: { name: 'index_related_contents_on_child_relationable' }
+      t.references :related_content, index: { name: 'opposite_related_content' }
+      t.timestamps
+    end
+
+    add_index :related_contents, [:parent_relationable_id, :parent_relationable_type, :child_relationable_id, :child_relationable_type], name: "unique_parent_child_related_content", unique: true, using: :btree
+  end
+end
diff --git a/db/migrate/20171127230716_add_time_reported_to_related_content.rb b/db/migrate/20171127230716_add_time_reported_to_related_content.rb
new file mode 100644
index 000000000..5cca12cf3
--- /dev/null
+++ b/db/migrate/20171127230716_add_time_reported_to_related_content.rb
@@ -0,0 +1,5 @@
+class AddTimeReportedToRelatedContent < ActiveRecord::Migration
+  def change
+    add_column :related_contents, :times_reported, :integer, default: 0
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index f2dd62428..4d426cf9e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171115164152) do
+ActiveRecord::Schema.define(version: 20171127230716) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -851,6 +851,22 @@ ActiveRecord::Schema.define(version: 20171115164152) do
   add_index "proposals", ["title"], name: "index_proposals_on_title", using: :btree
   add_index "proposals", ["tsv"], name: "index_proposals_on_tsv", using: :gin
 
+  create_table "related_contents", force: :cascade do |t|
+    t.integer  "parent_relationable_id"
+    t.string   "parent_relationable_type"
+    t.integer  "child_relationable_id"
+    t.string   "child_relationable_type"
+    t.integer  "related_content_id"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+    t.integer  "times_reported",           default: 0
+  end
+
+  add_index "related_contents", ["child_relationable_type", "child_relationable_id"], name: "index_related_contents_on_child_relationable", using: :btree
+  add_index "related_contents", ["parent_relationable_id", "parent_relationable_type", "child_relationable_id", "child_relationable_type"], name: "unique_parent_child_related_content", unique: true, using: :btree
+  add_index "related_contents", ["parent_relationable_type", "parent_relationable_id"], name: "index_related_contents_on_parent_relationable", using: :btree
+  add_index "related_contents", ["related_content_id"], name: "opposite_related_content", using: :btree
+
   create_table "settings", force: :cascade do |t|
     t.string "key"
     t.string "value"
diff --git a/db/seeds.rb b/db/seeds.rb
index 0e49983a5..6ef55067c 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -116,3 +116,6 @@ Setting['proposal_improvement_path'] = nil
 Setting['map_latitude'] = 51.48
 Setting['map_longitude'] = 0.0
 Setting['map_zoom'] = 10
+
+# Related content
+Setting['related_contents_report_threshold'] = 5
diff --git a/spec/factories.rb b/spec/factories.rb
index b98fc7adb..1ac2f3ebd 100644
--- a/spec/factories.rb
+++ b/spec/factories.rb
@@ -882,4 +882,7 @@ LOREM_IPSUM
     end
   end
 
+  factory :related_content do
+  end
+
 end
diff --git a/spec/models/relation_spec.rb b/spec/models/relation_spec.rb
new file mode 100644
index 000000000..86bbe2c14
--- /dev/null
+++ b/spec/models/relation_spec.rb
@@ -0,0 +1,76 @@
+require 'rails_helper'
+
+describe RelatedContent do
+
+  let(:parent_relationable) { create([:proposal, :debate, :budget_investment].sample) }
+  let(:child_relationable) { create([:proposal, :debate, :budget_investment].sample) }
+
+  it "should allow relationables from various classes" do
+    expect(build(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable)).to be_valid
+    expect(build(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable)).to be_valid
+    expect(build(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable)).to be_valid
+  end
+
+  it "should not allow empty relationables" do
+    expect(build(:related_content)).not_to be_valid
+    expect(build(:related_content, parent_relationable: parent_relationable)).not_to be_valid
+    expect(build(:related_content, child_relationable: child_relationable)).not_to be_valid
+  end
+
+  it "should not allow repeated related contents" do
+    related_content = create(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable)
+    new_related_content = build(:related_content, parent_relationable: related_content.parent_relationable, child_relationable: related_content.child_relationable)
+    expect(new_related_content).not_to be_valid
+  end
+
+  describe 'create_opposite_related_content' do
+    let(:parent_relationable) { create(:proposal) }
+    let(:child_relationable) { create(:debate) }
+    let(:related_content) { build(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable) }
+
+    it 'creates an opposite related_content' do
+      expect { related_content.save }.to change { RelatedContent.count }.by(2)
+      expect(related_content.opposite_related_content.child_relationable_id).to eq(parent_relationable.id)
+      expect(related_content.opposite_related_content.child_relationable_type).to eq(parent_relationable.class.name)
+      expect(related_content.opposite_related_content.parent_relationable_id).to eq(child_relationable.id)
+      expect(related_content.opposite_related_content.parent_relationable_type).to eq(child_relationable.class.name)
+      expect(related_content.opposite_related_content.opposite_related_content.id).to eq(related_content.id)
+    end
+  end
+
+  describe 'relationable destroy' do
+    let(:parent_relationable) { create(:proposal) }
+    let(:child_relationable) { create(:debate) }
+
+    it 'destroys both related contents involved' do
+      related_content = create(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable)
+      expect { related_content.parent_relationable.destroy }.to change { RelatedContent.all.count }.by(-2)
+      expect(child_relationable.related_contents).to be_empty
+    end
+  end
+
+  # TODO: Move this into a Relationable shared context
+  describe '#report_related_content' do
+    it 'increments both relation and opposite relation times_reported counters' do
+      related_content = create(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable)
+      parent_relationable.report_related_content(child_relationable)
+
+      expect(related_content.reload.times_reported).to eq(1)
+      expect(related_content.reload.opposite_related_content.times_reported).to eq(1)
+    end
+  end
+
+  describe '#relationed_contents' do
+    before do
+      create(:related_content, parent_relationable: parent_relationable, child_relationable: create(:proposal), times_reported: 6)
+      create(:related_content, parent_relationable: parent_relationable, child_relationable: child_relationable)
+    end
+
+    it 'returns not hidden by reports related contents' do
+      expect(parent_relationable.relationed_contents.count).to eq(1)
+      expect(parent_relationable.relationed_contents.first.class.name).to eq(child_relationable.class.name)
+      expect(parent_relationable.relationed_contents.first.id).to eq(child_relationable.id)
+    end
+  end
+
+end