diff --git a/.travis.yml b/.travis.yml
index ba949e8..4f5461c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ rvm:
 
 services:
   - postgresql
+  - elasticsearch
 
 addons:
   postgresql: "9.5"
diff --git a/Gemfile b/Gemfile
index 5528071..12a79e7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -69,6 +69,10 @@ gem 'byebug', platform: :mri
 # for corss-site communication
 gem 'rest-client'
 
+# Elasticsearch
+gem 'elasticsearch-model'
+gem 'elasticsearch-rails'
+
 group :development, :test do
   gem 'ffaker'
   gem 'factory_girl_rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2df9f09..71cc958 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,6 @@
 GIT
-  remote: https://github.com/seuros/capistrano-puma.git
-  revision: 1d7cca2e431c23943ebcde19588169ed12025833
+  remote: git://github.com/seuros/capistrano-puma.git
+  revision: 00708fa18a029cb34f46aef60f920106c0c00107
   specs:
     capistrano3-puma (3.1.0)
       capistrano (~> 3.7)
@@ -8,7 +8,7 @@ GIT
       puma (~> 3.4)
 
 GIT
-  remote: https://github.com/shouya/cant_cant_cant.git
+  remote: git://github.com/shouya/cant_cant_cant.git
   revision: 2dc86d3238febe461cfea48b8eeef38d0482c6d5
   specs:
     cant_cant_cant (0.1.10)
@@ -114,6 +114,19 @@ GEM
     docile (1.1.5)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
+    elasticsearch (5.0.4)
+      elasticsearch-api (= 5.0.4)
+      elasticsearch-transport (= 5.0.4)
+    elasticsearch-api (5.0.4)
+      multi_json
+    elasticsearch-model (5.0.1)
+      activesupport (> 3)
+      elasticsearch (~> 5)
+      hashie
+    elasticsearch-rails (5.0.1)
+    elasticsearch-transport (5.0.4)
+      faraday
+      multi_json
     enumerize (2.1.0)
       activesupport (>= 3.2)
     erubis (2.7.0)
@@ -123,6 +136,8 @@ GEM
     factory_girl_rails (4.8.0)
       factory_girl (~> 4.8.0)
       railties (>= 3.0.0)
+    faraday (0.12.1)
+      multipart-post (>= 1.2, < 3)
     ffaker (2.5.0)
     ffi (1.9.18)
     formatador (0.2.5)
@@ -142,6 +157,7 @@ GEM
       guard (~> 2.1)
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
+    hashie (3.5.5)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
     i18n (0.8.1)
@@ -186,6 +202,7 @@ GEM
     mini_portile2 (2.1.0)
     minitest (5.10.1)
     multi_json (1.12.1)
+    multipart-post (2.0.0)
     nenv (0.3.0)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
@@ -359,6 +376,8 @@ DEPENDENCIES
   carrierwave
   codeclimate-test-reporter
   coffee-rails (~> 4.2)
+  elasticsearch-model
+  elasticsearch-rails
   enumerize
   factory_girl_rails
   ffaker
@@ -396,4 +415,4 @@ DEPENDENCIES
   web-console
 
 BUNDLED WITH
-   1.13.6
+   1.14.6
diff --git a/app/controllers/api/v1/admin/posts_controller.rb b/app/controllers/api/v1/admin/posts_controller.rb
index 228cdf9..417a504 100644
--- a/app/controllers/api/v1/admin/posts_controller.rb
+++ b/app/controllers/api/v1/admin/posts_controller.rb
@@ -1,7 +1,7 @@
 module API::V1::Admin
   class PostsController < AdminController
     resource_description { short '管理介面文章/視頻 API' }
-    before_action find_record, only: %i(destroy show update publish)
+    before_action find_record, only: %i(destroy show update publish toggle_recommended)
 
     api :GET, '/admin/posts', 'List or filter on posts'
     param :title, String, desc: '标题'
@@ -62,6 +62,12 @@ def unpublish
       updated
     end
 
+    api :POST, '/admin/posts/:post_id/toggle_recommended', 'toggle推荐文章'
+    def toggle_recommended
+      @post.toggle!(:recommended)
+      updated
+    end
+
     def close
       @post.close!
       updated
diff --git a/app/controllers/api/v1/admin/users_controller.rb b/app/controllers/api/v1/admin/users_controller.rb
index ffe1a3a..ba968db 100644
--- a/app/controllers/api/v1/admin/users_controller.rb
+++ b/app/controllers/api/v1/admin/users_controller.rb
@@ -11,5 +11,10 @@ def permissions
         }
       end
     end
+
+    api :GET, '/admin/info', 'Get current user\' info'
+    def info
+      success current_user_state
+    end
   end
 end
diff --git a/app/controllers/api/v1/comments_controller.rb b/app/controllers/api/v1/comments_controller.rb
index d2d5a56..6eccab8 100644
--- a/app/controllers/api/v1/comments_controller.rb
+++ b/app/controllers/api/v1/comments_controller.rb
@@ -2,11 +2,12 @@ module API::V1
   class CommentsController < APIController
     resource_description { short '評論' }
     before_action :find_commentable
+    before_action :find_comment, only: %i(like unlike)
 
     api :GET, '/(posts|ads)/:id/comments',
         'List all comments under given post or ad'
     def index
-      success do
+      success(user_id: current_user_id) do
         paginated(@commentable.comments.normal)
       end
     end
@@ -21,6 +22,28 @@ def create
       created(comment)
     end
 
+    api :POST, '/posts/:post_id/comments/:comment_id/like', 'like specfic comment'
+    param :post_id, Integer, desc: 'post id', required: true
+    param :comment_id, Integer, desc: 'comment id', required: true
+    def like
+      if @comment.like(current_user_id)
+        render json: { message: 'success' }
+      else
+        render json: { error: 'already liked' }
+      end
+    end
+
+    api :POST, '/posts/:post_id/comments/:comment_id/unlike', 'unlike specfic comment'
+    param :post_id, Integer, desc: 'post id', required: true
+    param :comment_id, Integer, desc: 'comment id', required: true
+    def unlike
+      if @comment.unlike(current_user_id)
+        render json: { message: 'success' }
+      else
+        render json: { error: 'already unliked' }
+      end
+    end
+
     private
 
     def find_commentable
@@ -28,6 +51,10 @@ def find_commentable
                      Ad.  find_by(id: params[:ad_id])
     end
 
+    def find_comment
+      @comment = Comment.find_by(id: params[:comment_id])
+    end
+
     def comment_params
       params.permit(:content, :parent_id)
     end
diff --git a/app/controllers/api/v1/posts_controller.rb b/app/controllers/api/v1/posts_controller.rb
index da13ba8..6a10289 100644
--- a/app/controllers/api/v1/posts_controller.rb
+++ b/app/controllers/api/v1/posts_controller.rb
@@ -1,7 +1,7 @@
 module API::V1
   class PostsController < APIController
     resource_description { short '文章/視頻 API' }
-    before_action find_record, only: :show
+    before_action find_record, only: %i(show like unlike)
 
     api :GET, '/posts', 'List all posts'
     def index
@@ -10,7 +10,8 @@ def index
 
     api :GET, '/posts/:id', 'Show specific post'
     def show
-      success(@post)
+      @post.increment
+      success(@post, serializer: ::PostSerializer, user_id: current_user_id)
     end
 
     api :GET, '/posts/hot_in_week', 'Show a list of hot posts in recent 7-day'
@@ -23,5 +24,23 @@ def index_by_tag
       tag = params[:tag]
       success { Post.with_tag(tag).published }
     end
+
+    api :POST, '/posts/:id/like', 'Like specfic post'
+    def like
+      if @post.like(current_user_id)
+        render json: { message: 'success' }
+      else
+        render json: { error: 'already liked' }
+      end 
+    end
+
+    api :POST, '/posts/:id/unlike', 'Unlike specfic post'
+    def unlike
+      if @post.unlike(current_user_id)
+        render json: { message: 'success' }
+      else
+        render json: { error: 'already liked' }
+      end
+    end
   end
 end
diff --git a/app/models/comment.rb b/app/models/comment.rb
index 547dcc6..c7231cd 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -10,7 +10,6 @@
 #  depth            :integer          default(0)
 #  commentable_type :string
 #  commentable_id   :integer
-#  author           :string
 #  parent_id        :integer
 #  created_at       :datetime         not null
 #  updated_at       :datetime         not null
@@ -27,8 +26,11 @@
 
 class Comment < ApplicationRecord
   include SmartFilterable
+  include Likeable
   acts_as_paranoid
 
+  add_likeable
+
   belongs_to :commentable, polymorphic: true
 
   belongs_to :parent,
diff --git a/app/models/concerns/likeable.rb b/app/models/concerns/likeable.rb
new file mode 100644
index 0000000..d55fb85
--- /dev/null
+++ b/app/models/concerns/likeable.rb
@@ -0,0 +1,35 @@
+module Likeable
+  extend ActiveSupport::Concern
+
+  include AccountAPIHelper
+
+  class_methods do
+    def add_likeable
+      define_method 'like' do |user_id|
+        unless find_like(user_id)
+          Like.create(user_id: user_id, target: self)
+          true
+        end
+      end
+
+      define_method 'unlike' do |user_id|
+        if find_like(user_id)
+          find_like(user_id).destroy
+          true
+        end
+      end
+
+      define_method 'find_like' do |user_id|
+        @first_like_cached ||= Like.find_by(user_id: user_id, target: self)
+      end
+    end
+  end
+
+  def liked
+    !!(Like.find_by(user_id: @instance_options[:user_id], target: object))
+  end
+
+  def like_count
+    Like.where(target: object).count
+  end
+end
diff --git a/app/models/like.rb b/app/models/like.rb
new file mode 100644
index 0000000..43c909d
--- /dev/null
+++ b/app/models/like.rb
@@ -0,0 +1,19 @@
+# == Schema Information
+#
+# Table name: likes
+#
+#  id          :integer          not null, primary key
+#  user_id     :string
+#  target_type :string
+#  target_id   :string
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#
+# Indexes
+#
+#  index_likes_on_user_id_and_target_type_and_target_id  (user_id,target_type,target_id)
+#
+
+class Like < ApplicationRecord
+  belongs_to :target, polymorphic: true
+end
diff --git a/app/models/post.rb b/app/models/post.rb
index 911d836..cf31733 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -22,6 +22,8 @@
 #  created_at       :datetime         not null
 #  updated_at       :datetime         not null
 #  deleted_at       :datetime
+#  views            :integer
+#  recommended      :boolean          default(FALSE)
 #
 # Indexes
 #
@@ -38,9 +40,14 @@ class Post < ApplicationRecord
   include SmartFilterable
   include Countable
   include ProcessPostMeta
+  include Likeable
+  include Elasticsearch::Model
+  include Elasticsearch::Model::Callbacks
 
   acts_as_paranoid
 
+  add_likeable
+
   add_instance_counter_for :click
   add_instance_counter_for :publishing
   add_instance_counter_for :sharing
@@ -74,6 +81,11 @@ class Post < ApplicationRecord
   scope :with_tag, ->(tag) { where('? = ANY(tags)', tag) }
   scope :with_cover, -> { includes(:cover) }
 
+  mapping do
+    indexes :title,            type: :string, analyzer: :smartcn
+    indexes :content_rendered, type: :string, analyzer: :smartcn
+  end
+
   def article?
     !video?
   end
@@ -117,6 +129,41 @@ def close!
     save
   end
 
+  def increment(by = 1)
+    self.views ||= 0
+    self.views += by
+    save
+  end
+
+  def img_count
+    Nokogiri::HTML(content_rendered).css('img').length
+  end
+
+  def h2_list
+    Nokogiri::HTML(content_rendered).css('h2').map(&:text)
+  end
+
+  def related_posts(size = 4)
+    opts = {
+      query: {
+        more_like_this: {
+          fields: [:title, :content_rendered],
+          docs: [
+            {
+              _index: self.class.index_name,
+              _type: self.class.document_type,
+              _id: id
+            }
+          ],
+          min_term_freq: 2,
+          min_doc_freq: 5
+        }
+      },
+      size: size
+    }
+    self.class.__elasticsearch__.search(opts).records.to_a
+  end
+
   private
 
   def render_content
diff --git a/app/serializers/admin_short_post_serializer.rb b/app/serializers/admin_short_post_serializer.rb
index ef30f90..433ea4d 100644
--- a/app/serializers/admin_short_post_serializer.rb
+++ b/app/serializers/admin_short_post_serializer.rb
@@ -1,5 +1,12 @@
 class AdminShortPostSerializer < ApplicationSerializer
-  attributes :id, :title, :abstract, :state, :published_at
+  attributes :id,
+             :title,
+             :abstract,
+             :state,
+             :published_at,
+             :views,
+             :recommended
+             
   attribute :column_title do
     object.column.title
   end
diff --git a/app/serializers/application_serializer.rb b/app/serializers/application_serializer.rb
index 4c7ea38..e7b7155 100644
--- a/app/serializers/application_serializer.rb
+++ b/app/serializers/application_serializer.rb
@@ -1,3 +1,4 @@
 class ApplicationSerializer < ActiveModel::Serializer
   include RolePredicates
+  include Likeable
 end
diff --git a/app/serializers/comment_serializer.rb b/app/serializers/comment_serializer.rb
index cd26f97..106033e 100644
--- a/app/serializers/comment_serializer.rb
+++ b/app/serializers/comment_serializer.rb
@@ -23,5 +23,11 @@
 #
 
 class CommentSerializer < ApplicationSerializer
-  attributes :id, :content, :commenter, :parent_id, :created_at
+  attributes :id,
+             :content,
+             :commenter,
+             :parent_id,
+             :created_at,
+             :liked,
+             :like_count
 end
diff --git a/app/serializers/post_serializer.rb b/app/serializers/post_serializer.rb
index 678741d..fa58864 100644
--- a/app/serializers/post_serializer.rb
+++ b/app/serializers/post_serializer.rb
@@ -38,8 +38,12 @@ class PostSerializer < ApplicationSerializer
              :cover_url,
              :source,
              :link,
+             :liked,
              :tags,
-             :published_at
+             :published_at,
+             :like_count,
+             :img_count,
+             :h2_list
 
   has_one :column
 end
diff --git a/config/cant_cant_cant.yml b/config/cant_cant_cant.yml
index 214f002..800fcfd 100644
--- a/config/cant_cant_cant.yml
+++ b/config/cant_cant_cant.yml
@@ -111,6 +111,8 @@ admin: &admin
   api/v1/admin/collections#reset_members: deny
   api/v1/admin/collections#update: allow
 
+  api/v1/admin/users#info: allow
+
 dev: &dev
   <<: *all
   <<: *visitor
diff --git a/config/deploy/sandbox.rb b/config/deploy/sandbox.rb
index 32f137d..fe7e5aa 100644
--- a/config/deploy/sandbox.rb
+++ b/config/deploy/sandbox.rb
@@ -15,7 +15,7 @@
 set :repo_url, "file:///home/#{fetch(:user)}/gitrepo/#{fetch(:application)}.git"
 set :deploy_to, "/home/#{fetch(:user)}/projects/#{fetch(:application)}"
 
-set :puma_bind,               "unix://#{shared_path}/tmp/sockets/#{fetch(:application)}-puma.sock"
+set :puma_bind,               "unix://#{shared_path}/tmp/sockets/puma.sock"
 set :puma_state,              "#{shared_path}/tmp/pids/puma.state"
 set :puma_pid,                "#{shared_path}/tmp/pids/puma.pid"
 set :puma_access_log,         "#{release_path}/log/puma.error.log"
diff --git a/config/routes.rb b/config/routes.rb
index 2dc7609..8647227 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -4,10 +4,19 @@
   namespace :api do
     namespace :v1, except: [:new, :edit] do
       root to: 'home#web_index'
+     
+      resources :ads, only: [:index]
+
       resources :collections, only: [:index, :show]
 
       resources :posts, only: [:index, :show] do
-        resources :comments, only: [:index, :create]
+        post 'like', to: 'posts#like'
+        post 'unlike', to: 'posts#unlike'
+
+        resources :comments, only: [:index, :create] do
+          post 'like', to: 'comments#like'
+          post 'unlike', to: 'comments#unlike'
+        end
         get 'by-tag/:tag', to: 'posts#index_by_tag', on: :collection
       end
       resources :columns, only: [:index, :show]
@@ -15,6 +24,7 @@
       namespace :admin do
         resources :posts do
           patch :publish, :draft, :close
+          post :toggle_recommended
           get :filter, :today_statistics, on: :collection
 
           get :comments, to: 'comments#index_for_commentable'
@@ -22,6 +32,7 @@
 
         get 'tags', to: 'tags#index'
         get 'permissions', to: 'users#permissions'
+        get 'info', to: 'users#info'
 
         resources :ads do
           get :comments, to: 'comments#index_for_commentable'
diff --git a/db/migrate/20170531061242_create_likes.rb b/db/migrate/20170531061242_create_likes.rb
new file mode 100644
index 0000000..9e46766
--- /dev/null
+++ b/db/migrate/20170531061242_create_likes.rb
@@ -0,0 +1,13 @@
+class CreateLikes < ActiveRecord::Migration[5.0]
+  def change
+    create_table :likes do |t|
+      t.string :user_id
+      t.string :target_type
+      t.string :target_id
+
+      t.timestamps
+    end
+
+    add_index :likes, [:user_id, :target_type, :target_id]
+  end
+end
diff --git a/db/migrate/20170601021434_add_fields_to_posts.rb b/db/migrate/20170601021434_add_fields_to_posts.rb
new file mode 100644
index 0000000..cb9c4e6
--- /dev/null
+++ b/db/migrate/20170601021434_add_fields_to_posts.rb
@@ -0,0 +1,6 @@
+class AddFieldsToPosts < ActiveRecord::Migration[5.0]
+  def change
+    add_column :posts, :views, :integer
+    add_column :posts, :recommended, :boolean, index: true, default: false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index f963ae3..5fc2002 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170410165313) do
+ActiveRecord::Schema.define(version: 20170601021434) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -72,7 +72,6 @@
     t.integer  "depth",            default: 0
     t.string   "commentable_type"
     t.integer  "commentable_id"
-    t.string   "author"
     t.integer  "parent_id"
     t.datetime "created_at",                   null: false
     t.datetime "updated_at",                   null: false
@@ -100,6 +99,15 @@
     t.datetime "updated_at", null: false
   end
 
+  create_table "likes", force: :cascade do |t|
+    t.string   "user_id"
+    t.string   "target_type"
+    t.string   "target_id"
+    t.datetime "created_at",  null: false
+    t.datetime "updated_at",  null: false
+    t.index ["user_id", "target_type", "target_id"], name: "index_likes_on_user_id_and_target_type_and_target_id", using: :btree
+  end
+
   create_table "posts", force: :cascade do |t|
     t.string   "title"
     t.text     "abstract"
@@ -120,6 +128,8 @@
     t.datetime "created_at",                       null: false
     t.datetime "updated_at",                       null: false
     t.datetime "deleted_at"
+    t.integer  "views"
+    t.boolean  "recommended",      default: false
     t.index ["authors"], name: "index_posts_on_authors", using: :btree
     t.index ["column_id"], name: "index_posts_on_column_id", using: :btree
     t.index ["deleted_at"], name: "index_posts_on_deleted_at", using: :btree