We're implementing a change to the way comments are displayed today. Facebook and Know Your Meme comments will be selected using a tabbed interface, with the KYM comments open by default (shown below).
If you are not logged in you will need to click the "Display Comments" button to show the tabbed interface (shown below). If you are logged in to your account you will not see this button.
Please chime in here with any questions, feedback and bug reports. Thanks!