It looks like Disqus added a new feature called "Discovery". This feature will pull in either external links to your Disqus comments area or pull in links to other pages of your website.

The Discovery box is our latest discovery feature in Disqus. It is a native place for users to find new discussions, stories and other content on your site and from other sites across the web.

You can read "Introducing Promoted Discovery and F.A.Q." here.

You cannot control the links that Disqus pulls in. If you are not interested in having links to third party websites in your Disqus comments area, you will need to deactivate this feature by logging into your Disqus Account and then following these steps:

1. Login to your account
2. In the upper right hand corner, click on the Admin tab
3. Click on Settings
4. Click on the Discovery Tab
5. Select "Just comments"
6. Scroll down to the bottom and click the "Save" button