Use the facebook album generator tool:

https://ontargetwebdesign.net/fb-album-iframe.html 

Instructions

1. Open photo album on Facebook. (Go to your page > click photos on the side menu > click on your album)
2. In the address bar, copy the numbers at the end of your URL.
3. Paste those numbers into the marked section of the code below.
4. Copy this code and paste it into your Article in joomla. (Switch to code / html view)
5. Save the page and you're done!

<iframe width="540" height="700" style="border: none; overflow: hidden;"
src="https://www.facebook.com/plugins/post.php?
href=https://www.facebook.com/media/set/?set=a.PASTEYOURURLNUMBERSHERE&type=1&width=540"
frameborder="0" scrolling="no" ></iframe>

Watch the video