By popular demand, I've been asked by other FriendFeed users to highlight how I use the popular social lifestreaming site. So far the series has covered the "Hide" function, the bookmarklet, advanced search, how to integrate with Google Talk, how you can incorporate comments and determine an item's original source. Today, figuring out who you're engaging with on the service.So far, unlike most social networks out there, FriendFeed doesn't utilize a person's profile as the ...