Reading site html when it expands automatically [duplicate]

This question already has an answer here:

• Scrape data generated by javascript on server-side from webpages.aspx 1 answer

I want to read the content (html) of a certain address. I do a GET command, receive the html and I do what I want to do with it, no problem here.

The problem happens when a site expends itself as you scroll down (for example, Facebook's wall, this is not what I'm trying to read, it's just an example). Is there any way to simulate that expansion or any other method I can use in order to read more and more of the content of such site?

My question is different in the way that I'm developing a desktop application and cannot use js manipulation on that site.