Grammys: Kendrick Lamar, Lady Gaga's David Bowie Tribute, Ed Sheeran Top Social Moments

The ceremony's Lionel Richie tribute, Meghan Trainor's best new artist win and Justin Bieber also were hot topics on Facebook and Twitter.

With the Grammys broadcast live coast-to-coast for the first time Monday night, viewers nationwide could share their thoughts on the show on Facebook and Twitter during the same three-and-a-half hour time period without West Coast residents worrying about having a big performance or win spoiled.

On both platforms, Kendrick Lamar's provocative performance of "The Blacker the Berry" and "Alright" was a heavily buzzed-about moment, coming in at second place on Facebook's and Twitter's list of most talked-about parts of the show. Lamar began his performance chained to a group of African-American men dressed as inmates in front of a jail backdrop and ended it with a backdrop showing a map of Africa with the word "Compton" in the center.

Beyond that, Facebook's and Twitter's moments varied, with Lady Gaga's David Bowie tribute — in which the singer performed a medley of Bowie's hits while sporting flame-orange hair and blue eye shadow — ranking as the most- talked-about moment on Facebook and Ed Sheeran's surprise song of the year win for "Thinking Out Loud" topping Twitter's list of the most-tweeted moments. The third and final most-tweeted moment was Meghan Trainor's emotional best new artist win.

On Facebook, the Grammys' Lionel Richie tribute, after which the man himself joined Demi Lovato, John Legend, Luke Bryan, Trainor and Tyrese Gibson for "All Night Long," after the singers had performed a medley of Richie's hits, ranked as the third most talked-about moment. Chris Stapleton's and Justin Bieber's performances rounded out Facebook's top five moments in the fourth and fifth spots, respectively.

Bieber and Lamar both made Twitter's list of most-tweeted-about artists, in the first and second spots, with Taylor Swift, Selena Gomez and Adele ranking as the third, fourth and fifth most-tweeted-about artists.

Gomez's ranking is noteworthy because she didn't perform, nor was she nominated, but she presented a performance by Andra Day and Ellie Goulding and accompanied Swift to the show, sitting beside and supporting her best friend during the ceremony.