Matt Damon, Ben Affleck, Whoopi Goldberg, Pay Tribute to Robin Williams

PHOTO: Robin Williams teaching a class in a scene from the film "Dead Poets Society," 1989.PlayGetty Images
WATCH The World Reacts to Robin Williams' Death

Relatives, friends and celebrities ignited social media with reactions to the death of beloved actor Robin Williams, who died Monday at 63 years old.

Recently, Ben Affleck, Williams' co-star from "Good Will Hunting" opened up about his "friend."

"Heartbroken. Thanks chief -- for your friendship and for what you gave the world. Robin had a ton of love in him. He personally did so much for so many people. He made Matt and my dreams come true," Affleck wrote on Facebook, referring to his "Good Will Hunting" co-star Matt Damon. "What do you owe a guy who does that? Everything. May you find peace my friend. #RobinWilliams," he added.

Damon also released a comment on the passing of his former co-star. "Robin brought so much joy into my life and I will carry that joy with me forever," he said. "He was such a beautiful man. I was lucky to know him and I will never, ever forget him."

Nathan Lane, Williams' "Bird Cage" co-star, added similar sentiments about the late actor.

"I feel I have to say something more than just 'heartbreaking and shocking' which everyone has said and I feel as well, but something a little more personal. Thus the following: One day in 1995 while riffing in the character of a snobby French toy store owner, Robin made me laugh so hard and so long that I cried," he said in a statement. "It seemed to please him no end. Yesterday I cried again at the thought that he was gone."

He added, "What I will always remember about Robin, perhaps even more than his comic genius, extraordinary talent, and astounding intellect, was his huge heart -- his tremendous kindness, generosity, and compassion as an acting partner, colleague, and fellow traveler in a difficult world. My heartfelt condolences to his wife and family."

His longtime friend, Whoopi Goldberg, tweeted, "BillyCrystal is right ... There are No words."

Glenn Close, his co-star in "The World According to Garp," called Williams a friend, and more.

"Robin was a world treasure," she wrote. "As we mourn his tragic death, we must remember him for the great waves of laughter that he was able to [e]llicit from us, how his humor and insights -- though they came from a place of pain and uncertainty -- connected us and reminded us of how flawed and fragile ... how human we are ... how we are capable of moments of inspired transcendence and others of unspeakable despair.

"Robin had it all," she wrote. "I am so deeply thankful that this dearly loved man graced this particular planet."

Williams' daughter, Zelda, posted a quote by Antoine de Saint-Exupery, the French writer and poet.

"You -- you alone will have the stars as no one else has them. ... In one of the stars I shall be living. In one of them I shall be laughing. And so it will be as if all the stars were laughing, when you look at the sky at night. ... You -- only you -- will have stars that can laugh," the quote read.

She added, "I love you. I miss you. I'll try to keep looking up."

President Obama issued a statement on the "one of a kind" actor.

Bill Clinton: "He will be missed by so many."

From Buzz Aldrin, via Facebook

"I regarded Robin Williams as a friend and fellow sufferer. His passing is a great loss. The torment of depression and the complications of addiction that accompany it affect millions, including myself and family members before me - my grandfather committed suicide before I was born and my mother the year before I went to the moon - along with hundreds of veterans who come to a similar fate each year. As individuals and as a nation we need to be compassionate and supportive of all who suffer and give them the resources to face life. ?#?RobinWilliams RIP"

Longtime friend Billy Crystal said he was shocked by the death.

English actress Minnie Driver, who famously played alongside Williams in "Good Will Hunting," tweeted about her heartbreak.

"Sesame Street" remembered Williams as the actor who always made others smile.

Mara Wilson, who played Williams’ onscreen daughter in “Mrs. Doubtfire,” wrote that she was “very sad, very upset.”

Comedian Ricky Gervais called Williams “a lovely man.”

Rep. Nancy Pelosi, D-California, reflected on Williams’ California roots.

Russell Crowe reflected on his humor.

Ron Howard, who watched the actor's career take flight with his Mork character, called him a "force" and a "sweet soul."

Fellow "Happy Days" star Henry Winkler was said he was thankful to witness Williams' brilliance.

Neil Patrick Harris said he was shocked by the actor's death.

Michael J. Fox said he was saddened by the loss.

Lady Gaga expressed hopes that the death would bring visibility and understanding to depression.

Kevin Spacey called Williams a "great man."

Sarah Michelle Gellar starred alongside Williams in the sitcom "The Crazy Ones."

James Wolk, who also starred on "The Crazy Ones," poste a photo and called Williams "a guiding light, a role model, and an inspiration."

Comedian Steve Martin tweeted about the loss of an old friend.

Ellen DeGeneres wrote about her disbelief.

Jimmy Kimmel remembered Williams as a sweet man.

Demi Lovato reflected on his movie successes.

The U.S. Air Force recounted Williams' role in "Good Morning, Vietnam," in which he played an Armed Forces Radio DJ.

The Academy of Motion Pictures also reflected on Williams' death.

The Grammys expressed their gratitude.

Sarah Silverman called Williams "pure love."

Mia Farrow tweeted in disbelief.

Kathy Griffin shared a photo of herself and the revered actor.

Joel McHale called Williams his hero.

Comedy video website Funny or Die remembered Williams.

Comedian Michael Ian Black shared his condolences for the Williams family.

"GMA's" Michael Strahan shared his grief.

Tim Allen tweeted his sadness.

Bob Saget tweeted his wish that Williams find peace.

Musician and Roots member Questlove reflected on how inspiring the revered actor was to him.

Rihanna shared her heartbreak to more than 36 million followers.

Kelly Clarkson said she was saddened by the news of Williams' passing.