Google released YouTube Rewind 2013. YouTube Rewind 2013 is a playlist of the top trending, searched, and viewed videos of the year. Part of that playlist includes an interactive YouTube rewind timeline. The rewind timeline is a short video that has other videos linked to it. You can click on an element in the video to jump to one of the most-watched videos of the year.
You and your students can create your own "Rewind 2013" interactive videos. By using YouTube annotations (directions here) you can link videos one of your own. As an academic project I might start by having students talk, on video, about the most important events of 2013. Then after uploading that video to YouTube students can insert linked annotations to videos about the events they talked about. For example, if my students were talking about the biggest events in sports in 2013 when their video got to the point in which they talk about the World Series, they would link to highlights of the Red Sox winning the World Series.