Recommend posts on /posts/show based on voting patterns

app/views/posts/partials/index/_similar.html.erb

@@ -0,0 +1,7 @@
+<div class="recent-posts">
+  <p>You might also like:</p>
+
+  <div>
+    <%= PostSets::Similar.new(post).presenter.post_previews_html(self) %>
+  </div>
+</div>

app/views/posts/show.html.erb

@@ -82,6 +82,10 @@
         </div>
       <% end %>
 
+      <% if RecommenderService.available?(@post) %>
+        <%= render "posts/partials/index/similar", post: @post %>
+      <% end %>
+
       <% if @post.presenter.has_nav_links?(self) %>
         <%= render "posts/partials/show/nav_links", :post => @post, :position => "bottom" %>
       <% end %>