Hello, we've worked together in the past.
if your ultimate goal is to get most instagram user handles with > 500k followers, I can suggest better ways than grabing urls from comments.
Also, if you looking forward to run this script from your server, you should be aware that instagram will ban your server's ip after certain amount of requests.
this can be avoided by using proxies.
I have all needed resources and can run script from my server, providing you with good user handles.
bid is for 1 million instagram urls processed.
(I'll be able to send you all urls that I process)
Thanks