Welcome 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. Hosted by Billboard's Joe Levy, you can watch episode 4, which features Robin Thicke, Sam Smith, FKA Twigs and more, right here.

 

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

 

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

Robin Thicke's apologetic single, "Get Her Back," became No.1 on the Trending 140 chart as soon as its accompanying video, which features a Paula Patton look-alike, debuted on June 23.

Robin Thicke & Paula Patton: A Love Timeline Through His Music

Sam Smith climbed to No. 2 on the Trending 140 when a video of him covering Whitney Houston's "How Will I Know" for Sirius XM surfaced on YouTube. FKA Twigs' "Two Weeks" single climbed to No. 1 on the Trending 140 chart after its video debuted.

Sam Smith's Google+ Hangout With Billboard

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.

 

Watch Last Week's Episode Featuring Lana Del Rey, Maroon 5 & Ab-Soul