Sites that lead to sites that lead to sites that lead to...

How do these work?

ill get a site from clicking SR, fill out a few things, which then wants me to do something in a 3rd site.

How would all of these separate sites possibly get back to SR for credit?

Ive never understood ones like that.

I call them offers within offers. you never know when your done signing up for the initial offer because it asks you a hundred more things and to view a hundred more offers. (i remember a coke vs pepsi one like that).

With things like this how do you know the initial request is done?

Sometimes there are clicks that say "skip". they are usually in the right hand corner or on the bottom of the page. You have to wait for the whole page to load to find them.