Disqus 2.0 is now available for Windows Phone. Disqus is one of the largest blog comment systems on the web. Go to any blog and you're likely to see Disqus powering the comment section of the site. This mobile app for Windows Phone allows you stay current with your discussions by giving you notifications and so much more. Today's update to version 2.0 introduces a major redesign for Windows Phone 8.1.