Page Source does not display all content when scrolled down (Social Media Sites)

I am trying to retrieve the list of all the followers of my social media account (facebook, or else, Let's say this Soundcloud page for example.)

To display followers on the browser, one has to scroll down progressively all the way down until the full list is loaded on the browser. However When you click on view source on any browser, you don't see these followers.

I scrolled through the source code and I have spotted some stodgy scripts here and there. I can try to decypher them but I need a start point and hints.

Thanks in advance.