Select a single album from your Facebook profile and display it anywhere on your WordPress site. Instead of a whole gallery section, this is better suited for articles like when you write about an event and wish to show the photos made there. Or when you write about a project and you just insert its single album from your company Facebook Page. Whenever you add new images to the selected gallery on Facebook, your site will reflect the changess. It's always synchronized from Facebook. Say you delete a picture, it'll get removed from Justified Image Grid too. If you change the description of a photo, that text gets updated on your site as well.
This focuses on always visible new content. It's great for homepages. The remaining content is still accessible from the lightbox - the gallery has 100 images. This is entirely achieved just by choosing Preset 10: Hidden that uses the "hidden limit" setting.
The Feed is similar to the Timeline album, but it may contain different or extra photos. This includes cover picture changes and posts that were posted by users. In other words, things that normally do not appear in the Timeline album. It depends on your specific usage which one you'll find more useful. They may not even be different at times!
Videos are treated separately from photos on Facebook. They reside in a special, automatic album called Videos. Justified Image Grid plays them using a HTML5 video player found natively in WordPress. Not every lightbox supports videos, so select an appropriate one.