Muhammad Ali mourned by Hollywood, sports royalty

Reactions to the death of Muhammad Ali came fast and furious Friday on social media, so swift it would have surely pleased the legendary boxer.

Twitter lit up with several hashtags each pushing anywhere from 500k to nearly a million tweets, including "#MuhammadAli," "#CassiusClay," "#DamnAli" and "#RIPGOAT" — the GOAT a shorthand for one of Ali's nicknames, Greatest of All Time.

"Ali, you were generous every time I met you. Thank you for all you did for so many. Your memory will live on forever," wrote Caitlyn Jenner.

Also Read: Muhammad Ali, Legendary Boxer, Dies at 74

Ali contemporary George Foreman weighed in, as well as boxers Manny Pacquiao and Oscar de la Hoya. The boxer was hospitalized on Thursday in Arizona for respiratory issues. His condition deteriorated and he passed away on Friday evening, his family confirmed.

Ali also suffered from Parkinson's disease, which was diagnosed in 1984. Read the latest tributes:

Ali, you were generous every time I met you. Thank you for all you did for so many. Your memory will live on forever #Olympicgold #GOAT

Ralph Ali, Frazier & Foreman we were 1 guy. A part of me slipped away, "The greatest piece" https://t.co/xVKOc9qtub

— George Foreman (@GeorgeForeman) June 4, 2016

RIP @muhammadali, a legend who transcended sport and was a true champion for all. #thegreatest #MuhammadAli pic.twitter.com/vjmXlXaHip

— Oscar De La Hoya (@OscarDeLaHoya) June 4, 2016

Manny Pacquiao releases a statement on the passing of Muhammad Ali. pic.twitter.com/hRa2kM3CLr

I met #Ali once. He was a great role model and a great man. Sending my thoughts and prayers to his family tonight.

— Barry Sanders (@BarrySanders) June 4, 2016

"If my mind can conceive it & my heart can believe it—then I can achieve it." Muhammad Ali taught us all to dream. pic.twitter.com/my6Cdw2p12

— Scottie Pippen (@ScottiePippen) June 4, 2016

Prince and Ali. ???????????????????????????????? pic.twitter.com/TwZIwQ0qgI

Muhammad Ali was kind , gentle funny and always a gentleman to me and my family!!

— David Hasselhoff (@DavidHasselhoff) June 4, 2016

Float like a butterfly, Ali. May your wings take you to even greater heights #RIPMuhammadAli pic.twitter.com/XogZQHWNFZ

— Foster The People (@fosterthepeople) June 4, 2016

His may be the Greatest of 20th century American stories. Muhammad Ali, rest In peace 1942-2016

Thank God for Muhammad Ali. ????????????❤️❤️❤️ the greatest fighter there ever has been. All of us who fight for civil rights owe him a great debt.

— Wondaland Records (@wondaland) June 4, 2016

i join in the chorus of those lamenting the passing of Muhammad Ali tonight. A gr8 champion & historic figure.

— Al Bernstein (@AlBernstein) June 4, 2016

R.I.P Muhammad Ali…so saddening #WorldsGreatest #Legendary

"I'm so fast, I can turn off the light and hop in the bed before the room gets dark." RIP Muhammad Ali #GOAT

— Larry Wilmore (@larrywilmore) June 4, 2016