fixes #739

app/assets/stylesheets/specific/posts.css.scss

@@ -59,6 +59,10 @@ article.post-preview {
   margin-left: 0.2em;
 }
 
+.low-post-count {
+  color: red;
+}
+
 body.mode-edit {
   background: #3A3;
 }

app/presenters/tag_set_presenter.rb

@@ -125,7 +125,8 @@ private
         post_count = counts[tag].to_s
       end
 
-      html << %{<span class="post-count">#{post_count}</span>}
+      is_underused_tag = counts[tag].to_i <= 10 && categories[tag] == Tag.categories.general
+      html << %{<span class="post-count#{is_underused_tag ? " low-post-count" : ""}">#{post_count}</span>}
     end
 
     html << "</li>"