Since their addition to Twitter, trending topics have provided powerful insight into what’s being said not only domestically–but internationally.

So when Twitter released their list of most discussed topics of 2009 on their blog Tuesday, the list not only reflected 12 months of conversation on Twitter, but the year’s most talked-about events. Events such UFC 100 and brands such as the Cavs–two clients that Digital Royalty works with.

You can view the full list of most discussed topics of 2009 on Mashable, where Twitter divided the comprehensive list of topic into subcategories such as news, people, movies, TV shows, technology, sports and hashtags.