Let your visitors add comments to your albums. Note, one guestbook is possible per folder, but no possibility to add separate guestbook for every image.
Enable Facebook commenting
Turn On/Off Facebook commenting. This feature can be used only if you have created an App on Facebook developer's page, and inserted the App ID through the Social panel.
Number of posts to show
How many post to show initially. Visitors can scroll down and Facebook will load more comments dynamically.
Enable Disqus commenting
Turn On/Off Disqus commenting.
Disqus Shortname
When you create a new site on disqus, it will offer you a "short name", which is usually your site's short name. Add it here so Disqus can identify you.