With 5.1 million albums sold in the United States, according to Nielsen SoundScan, and millions more worldwide, One Direction's success speaks for itself. But the British quintet isn't the only one enjoying fans' rabid devotion: In a phenomenon that can be called the One Direction effect, other artists are benefitting big time when the boy band associates with them.
Take Jason Derulo's hit single "Talk Dirty," which moves 4-3 on the Billboard Hot 100 in its eighth week on the chart. Last November, as part of 1D Day, a seven-hour YouTube live stream the members of One Direction unveiled a hilarious video of themselves dancing around half-naked to the song, which was already a hit in Europe but barely catching on stateside. The video quickly went viral, with 1D fans making their own YouTube clips dancing to "Talk Dirty." The number of YouTube detections-loosely defined as the number of plays from videos that other users have created -- for the song quickly spiked 630%, from 78,000 on Nov. 23 to 612,000 on Nov. 24, and has continued to grow. U.S. sales of "Talk Dirty" jumped too: After moving 4,000 units for six straight weeks, the song doubled to 8,000 the week ending Nov. 24, and sales have skyrocketed from there, selling 242,000 in the week ending Feb. 9.