Top social moments of the 2015 Oscars

From Lady Gaga's spot-on tribute to "The Sound of Music" to Patricia Arquette's enthusiastic acceptance speech, the 2015 Oscars had no shortage of powerful moments.

There were the awkward ones, too. What in the world was going on between John Travolta and Idina Menzel?

And what about this year's emcee?

First-time host Neil Patrick Harris made some wise-cracks about Hollywood -- some great, some new so hilarious. He showed off his musical talent in the opening number -- and showed off more of his body then we expected when he stripped down to his underwear a la "Birdman."

Facebook has tallied up the most-talked-about moments of Sunday's Academy Awards based on 21 million people with 58 million interactions related to the Oscars.

Check it out:

1. Lady Gaga sings "The Sound of Music," Julie Andrews makes surprise appearance

Lady Gaga nailed her tribute to the 50th anniversary of the "The Sound of Music" at the Oscars Sunday night.

The pop star plowed through song after song from the 1965 film, including "Edelweiss," "My Favorite Things" and "Sixteen Going on Seventeen."

After her last note, "The Sound of Music" star Julie Andrews came out to give Gaga a big hug.

"Dear Lady Gaga," said Andrews. "Thank you for that wonderful tribute. It really warmed my heart. It's hard to believe that 50 years have gone by since that joyous film was released."

"As for me -- how lucky can a girl get?" Andrews added.

2. "The Imitation Game" wins Best Adapted Screenplay

"The Imitation Game" lost out on best picture, and its star Benedict Cumberbatch failed to nab best actor -- but the movie did score the statuette for best adapted screenplay.

Screenwriter Graham Moore not only won for his first produced screenplay, but he also received a standing ovation for his acceptance speech. The film centers on Alan Turing, who cracked German codes in World War II but was convicted under the U.K.'s anti-gay laws of the 1950s and committed suicide two years later.

"So here's the thing," Moore said while onstage. "Alan Turing never got to stand on a stage like this and look out at all of these disconcertingly attractive faces. And I do. And that's the most unfair thing I think I've ever heard. So in this brief time here, what I want to use it to do is to say this: When I was 16 years old, I tried to kill myself, because I felt weird and I felt different, and I felt like did not belong. And now I'm standing here, and so I would like this moment to be for that kid who's out there who feels weird or feels different or feels she doesn't fit in anywhere. Yes you do. I promise you do."

3. "Birdman" wins best original screenplay

"Birdman" took home the prize for best original screenplay, topping "Nightcrawler," "Foxcatcher," "Boyhood" and "The Grand Budapest Hotel."

The movie follows a washed-up Hollywood star, played by Michael Keaton, who's trying to stage a comeback on Broadway.

Eddie Murphy took to the stage to present the award to Alejandro G. Iñárritu, Nicolás Giacobone, Alexander Dinelaris Jr. and Armando Bo.

4. Eddie Redmayne wins best actor

This category marked a tight race, but in the end Eddie Redmayne won for his portrayal of Stephen Hawking in "The Theory of Everything."

Eddie Redmayne on "The Theory of Everything"

"I don't think I'm capable of articulating quite how I feel. ... But please know that I'm fully aware I'm a lucky, lucky man," the 33-year-old British actor said at Sunday's ceremony.

Redmayne used the opportunity to talk about Hawking's disease: A motor neurone disease, also known as Lou Gehrig's disease, and amyotrophic lateral sclerosis.

"This Oscar belongs to all of those people around the world battling ALS," he said. He also dedicated it to "one exceptional family" that includes Hawking, his former wife, Jane Wilde, and their three children.

"I will be its custodian and I promise you I will look after him," Redmayne said of the Oscar statuette before , then directed an impish aside to his wife, Hannah, in the audience.

5. "Birdman" wins best picture

It came down to the wire for the evening's most coveted prize. Eight films were up for best picture, but the race seemed to be honing in on either "Boyhood" or "Birdman" -- although some insiders thought that "American Sniper" even had a chance to snag the statuette. When announcing "Birdman" as the winner, presenter Sean Penn joked about the film's Mexican-born director Alejandro Inarritu, saying, "Who gave this son of a bitch his green card? Birdman."

Upon hitting the stage, the director called on his fellow Mexicans to build a better government in his acceptance speech: "I want to dedicate this award for my fellow Mexicans, the ones who live in Mexico. I pray that we can find and build the government that we deserve. And the ones that live in this country who are part of the latest generation of immigrants in this country, I just pray that they can be treated with the same dignity and the respect of the ones who came before and (built) this incredible immigrant nation."

6. Alejandro González Iñárritu wins best director for "Birdman"

Alejandro Inarritu had already graced the stage earlier in the evening, taking home best director trophy for "Birdman." He topped "The Grand Budapest Hotel"; Richard Linklater, "Boyhood;" Bennett Miller, "Foxcatcher;" and Morten Tyldum, "The Imitation Game."

Inarritu joked that Michael Keaton's "tighty whities" were a good luck charm that helped him earn his second Oscar win on Sunday night.

"They are tight, smell like spores," the "Birdman" director said. "They worked. I am here."

Then he got serious, saying, "I don't have a career. I have a life. Today I'm living it fully. Enjoying it completely. I don't know what will happen, but today is great."

7. Patricia Arquette wins best supporting actress

Patricia Arquette started her Oscars acceptance speech in a typical way: reading from a cue card to thank the cast and crew from "Boyhood."

But she ended it with a rousing push for gender equality that got both Meryl Streep and Jennifer Lopez cheering for their fellow actress amid thunderous applause.

"To every woman who gave birth to every taxpayer and citizen of this nation, we have fought for everybody else's equal rights," the best supporting actress winner said. "It's our time to have wage equality once and for all and equal rights for women in the United States of America."

This marked Arquette's first Academy Award nomination and win. She also won a Golden Globe, Screen Actors Guild, BAFTA and New York Film Critics Circle honor for her role in "Boyhood."

8. John Legend and Common's "Glory" wins best original song

John Legend and Common's song "Glory" from the civil rights film "Selma" not only scored best original song, but their performance of it brought some of the audience members to tears.

"Forty-seven years ago the Oscars telecast was postponed for the first time in history...out of respect for Dr. Martin Luther King who was gunned down four days before the ceremony," Oscar winner Octavia Spencer addressed the crowd before introducing the performance. "Tonight, 50 years after Dr. King's march through Selma, Alabama, two artists have joined forces to create a song that speaks to the struggles that continue to this day."

9. Julianne Moore wins best actress

Oscar nominee Julianne Moore on "Still Alice" and her non-stop career

Ahead of the Oscars, almost all signs were pointing to Julianne Moore for the best actress win for her role as a woman with early-onset Alzheimer's disease in "Still Alice."

"I'm so happy, I'm thrilled that we were able to shine a light on Alzheimer's disease," Moore said during her acceptance speech. "So many people who have this disease feel marginalized. People who have Alzheimer's disease deserve to be seen so we can find a cure."

Moore spent months researching the part, by talking to women with disease, chatting with doctors and visited a long-term care facility.

10. Adam Levine & Maroon 5 perform "Lost Stars" from "Begin Again"

Adam Levine showed off his musical chops -- including that sweet falsetto -- when he performed "Lost Stars" from "Begin Again." The track lost out to "Glory" for best original song, but his live version was a big win.

Tell us: What was your favorite Oscars 2015 moment?