A list pane found on the right-hand side on the hompage of the Social networking site Twitter. It Shows the current most popular and talked-about topics on twitter. The ranking are in real time and are changed respectively.
Note: this can be collapsed and expanded
Guy: I got on twitter today and saw that Michael Jackson was finally off the trending topics
Girl: Only to be replaced by Chris Brown and Rihanna
Guy: So much for trending topics being the source of breaking news
Girl: yeah.... *sigh*