WordPress.org

Upload the "Published Articles Since Last Visit" plugin to your blog and just go through the following steps: 1. Activate it; 2. Visit the settings page and customize it (Settings > Published Articles Since Last Visit); 3. Add <?php norilsk_filter($content); ?> just before <?php if (have_posts()) : ?> in the Main Index File (index.php) of your theme folder; 4. Preview how your returning visitors will see it (add ?date_prev=1971 to the links where you have set up to display the list of published articles since visitor's last visit) 4. Connect to Google Analytics to get reports on the plugin impact for your traffic.

That's it. Enjoy.