There isn't really an easy way to browse users per-say but you can do what
burningdoom suggested. An other way to find people is, funny enough, through games. When you're viewing a game entry there are tabs near the entries name: Info, History, Collections, Sell Lists, Wish Lists. When you click on Collections it will show you all the users that have that game in their library.
A browse User function would be a neat feature. Or maybe a leaderboard!