add additional meta tags for seo

app/logical/post_sets/base.rb

@@ -36,6 +36,10 @@ module PostSets
       false
     end
 
+    def best_post
+      nil
+    end
+
     def presenter
       raise NotImplementedError
     end

app/logical/post_sets/post.rb

@@ -26,7 +26,7 @@ module PostSets
     end
 
     def has_wiki?
-      is_single_tag? && ::WikiPage.titled(tag_string).exists? && wiki_page.visible?
+      is_single_tag? && ::WikiPage.titled(tag_string).exists? && wiki_page.visible? && wiki_page.body.present?
     end
 
     def has_blank_wiki?
@@ -184,5 +184,10 @@ module PostSets
     def presenter
       @presenter ||= ::PostSetPresenters::Post.new(self)
     end
+
+    def best_post
+      # be smarter about this in the future
+      posts[0]
+    end
   end
 end