I'm glad someone pointed this out. This feature has always existed. You didn't even have to do it through your web browser, Snapchat has always had a link within the app to view the profiles of your friends (including their "best friends").

seems like http://www.snapchat.com/sexgod696969 is doing really well.

on a related note. it would be amusing to trace all these relationships by scraping the site for common usernames and then following jumping down through their friends list.