Anybody who's used Twitter during the last few months is well aware that Justin Bieber is probably one of the most discussed topics in the history of the microblogging platform (although why that is, I'm not entirely certain - I prefer my singers post-pubescent). Indeed, if you go to Twitter's search engine and type in his name, you'll see a waterfall of literally thousands of tweets popping up - and yet, "Justin Bieber" won't show up in the list of trending topics. Why is that?
