President Obama, Bill Gates, Mark Zuckerberg, Others React to Steve Jobs' Death

Tech Gurus, Celebrities and Politicians Take to Twitter to Offer Condolences

Pete Cashmore, founder and CEO of Mashable.com

"@petecashmore: 'Your time is limited, so don't waste it living someone else's life.' -- Steve Jobs"

Arianna Huffington, The Huffington Post founder and CEO:

"@ariannahuff: My thoughts go out to Steve Jobs' family and friends. Thank you for changing our world."

Ashton Kutcher, Actor on "Two and a Half Men"

"@apluck: RIP Steve Jobs #DontCallMeIf #ThankYouSteve #iSad STAY IN BRAZIL SELENA"

"@aplusk: We have all surfed on the wake of Steve Jobs ship. Now we must learn to sail, but we will never forget our skipper."

Lance Armstrong, professional cyclist/cancer research foundation founder

"@lancearmstrong: 'A computer is the most remarkable tool that we've ever come up with. It's a bicycle for our minds' - Steve Jobs"

Mitt Romney, former governor of Massachusetts and Republican presidential candidate:

"@MittRomney: Steve jobs is an inspiration to American entrepreneurs. He will be missed."

Former California Gov. Arnold Schwarzenegger:

"@Schwarzenegger: Steve lived the California Dream every day of his life and he changed the world and inspired all of us. #ThankYouSteve"

Former California first lady Maria Shriver:

"@mariashriver: I'm going to turn off my Apple computer, iPhone and iPad tonight at 8pm and honor Steve with a moment of digital silence. Will you join me?"

"@mariashriver: I'm so happy that I knew him and was so blessed by his friendship. He impacted all of our lives and changed the world."

"@mariashriver: My heart weeps for all who worked with Steve and who loved him, especially my friend Laurene and their children."

Newt Gingrich, former House Speaker and Republican presidential candidate

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"@newtgingrich: Steve jobs was an American original-courageous, determined, creative, willing to take on the establishment-he will be missed."

Hermain Cain, Republican presidential candidate

"@THEHermanCain: This country is made great by those who personify the American Dream; Steve Jobs gave us new ways with which to dream"

Jon Huntsman, Republican presidential candidate

"@JonHuntsman: Sad to hear about the passing of Steve Jobs, a true inspiration and a great American innovator."

Jimmy Fallon, host of "Last Night With Jimmy Fallon"

@jimmyfallon: Thank you, Steve Jobs, for all of the fun and amazing ways you made our lives better....Sent from my iPhone.

Steve Levitan, co-creator/executive producer of ABC's "Modern Family":

"@SteveLevitan: I'm so sorry to hear about the death of Steve Jobs. He was truly one of my heroes. He leaves one hell of a legacy. #iSad"

Rick Warren, Evangelical Christian minister and author

"@RickWarren: Steve Jobs, the Thomas Edison of my generation. Miss him already."

Howard Stern, shock jock radio host.

"@howardstern: Steve Jobs was a true original. So Sad. A tremendous loss."

SnoopDogg, rapper

"@snoopdogg: RIP Steve Jobs Rest in peace homie."

Will.i.am, rapper/musician/actor

"@iamwill: #youchangetheworld we lost a great innovator...steve jobs designed a whole new world...he will be missed..."

Nicki Minaj, recording artist

"@NICKIMINAJ: An innovator. Contributed so much to this generation & beyond. RIP Steve Jobs."

Ryan Seacrest, "American Idol" host/radio talk show personality/producer

"@RyanSeacrest: 'Have the courage to follow ur heart & intuition. They already know what u truly want to become. Everything else is secondary.' - Steve Jobs"

Nancy Grace, TV host, "Dancing With the Stars" contestent

"@NancyGraceHLN: About to go to air & discovered news about Steve Jobs - My heart goes out to his family tonight. #RIP Steve Jobs"

Lebron James, Miami Heat forward

"@KingJames: R.I.P Steve Jobs. Someone who definitely left his mark on this world! Innovations that will live and last forever!!"

Neil Patrick Harris, Actor on "How I Met Your Mother"

"@ActuallyNPH: Rest in peace, Steve Jobs. Your genius will live on for generations to come..."

Zach Braff, Actor

"@zachbraff: RIP Steve Jobs. A legend. A visionary innovator."

Nick Lachey, singer, host of "The Sing-Off"

"@NickSLachey: Best wishes to the family of #stevejobs. What an amazing man and amazing life! Certainly, his legacy will be with us all forever. #RIP."