How many images can be displayed?
You can choose how many images from your selected Facebook album will be displayed in the gallery.
This options can be found when you click on a Config button in the desired Facebook gallery:
You can see this options under optional preferences:
You can control how many pictures will be displayed. You can also control the number of rows in the gallery combining this option and the row height option.
The app limits the number of images to 2000. However, the Facebook API is not limited in that respect. However, a huge number of pictures is not recommended as would slow down the page and damage the user experience.
The pictures will be loaded automatically as the user scrolls down the page.