I needed to do similar thing on other website.. it not a perfect solution.. but still.. :)
What i did is i recorded like 40-50 scrolldowns till the end of site.. and THEN do all actions.. like in your case.. scrape friends..
How can you loop items from a list list to a variable ?
Edit :
I think i've solved it .
For people who will find the answer to this in the future
set a new variable to "0" or the starting point of the list --->"Get Element" in list menu and at the "index" put your variable ----> to get the next list item do an increment to the variable set to "0"