Justin Bieber, Jack Ü, Selena Gomez, Ariana Grande & Carly Rae Jepsen: Real-Time Twitter Chart Rewind Ep. 39

Welcome back to Billboard's weekly video show "Real-Time Rewind," which recaps the past week's hottest action on the new Billboard Real-Time Twitter Charts --Trending 140 and Emerging Artists -- and the news that's driving the action. Joe Levy back in the studio in Episode 39, which features Justin Bieber, Selena Gomez, Ariana Grande and Carly Rae Jepsen.

Jack & Jack, John Legend, Common and Rihanna: Real-Time Chart Rewind Ep. 38

VIEW THE REAL-TIME CHARTS: TRENDING 140 | EMERGING ARTISTS

So what was happening on the Real-Time Charts this week?

On March 1, Justin Bieber turned 21 just a few days after his newest release with Jack Ü, the moniker Skrillex and Diplo have donned their collaborative project. Called "Where Are Ü Now" feat. Justin Bieber, the track has logged more than seven hours at the top of the Trending 140.

Selena Gomez has yet another chart topper with the producer everyone is calling her boyfriend, Zedd. "I Want You To Know" featuring Selena Gomez jumps straight to the No. 1 position on the Trending 140 when it was released Sunday Feb. 22. It's the second straight chart-topper for both Gomez and Zedd, she hit No. 1 with "The Heart Wants What It Wants" and he hit No. 1 with "Break Free," his track for Ariana Grande.

Ariana Grande is back at the top of the chart with her new song with Cashmere Cat, "Adore." More than nine of Grande's tracks have hit the top of the Trending 140 more than 189 different times. And finally, Carly Rae Jepsen's newest banger "I really Like You" hits the top of the chart, signaling the beginning of her triumphant return to making music.

The Trending 140 chart measures the acceleration of conversation around artists and their music, while the Emerging Artists chart measures the volume of tweets around new artists and their songs.