In 2013, 230 million users sent 500 million tweets every single day on Twitter—but what the hell were they talking about?

Twitter has published its 2013 roundup, breaking down activity on the microblogging sites month-by-month and in turn highlighting the hot topics of 2013. From helicopters crashing in London to new Popes, it's all there to explore.

The most retweeted tweet of the year? That was when Glee's Lea Michele admitted the death of her co-star and partner Cory Monteith, who died of a heroin and alcohol overdose in July. It was retweeted 408,266 times. President Obama's reelection victory tweet, however, still remains the most retweeted of all time.

Despite the fact that Twitter's music service has proven somewhat of a flop, the #Music hashtag was the top trend of 2013, while #nowplaying was at number 3. The number 2 slot? That went to #tcot—Top Conservatives on Twitter—that helps right-wingers find like-minded users.

Twitter's roundup also points out some of the more famous names to join the site in 2013, a list that includes Stephen King, Bill and Hillary Clinton, Robin Williams, Roger Federer,Madeleine Albright, and Sarah Jessica Parker. You can go read Twitter's full roundup here. [Twitter via Verge]