Upload date: April 6, 2015
Total views: 3,229,893,531
See You Again by Whiz Khalifa featuring Charlie Puth may no longer be the most-viewed clip on YouTube, but it is the video that stole Psy's crown to top the chart, hitting one billion views in just six months and two billion by September 2016.
The heartfelt track is part of the soundtrack for Fast & Furious 7 and now serves as an eternal memorial for Paul Walker, who died in a car crash while shooting the movie. Some log onto the video as a form of paying respect to the late actor, while others do so just to hear a moving song.
Fun fact: See You Again spent 12 non-consecutive weeks atop the US Billboard Hot 100 chart, equalling Eminem's Lose Yourself's record for the longest-running rap number-one single in the country.