Davy Jones' death was a crushing blow to thousands of famous people across the Internet -- including Al Roker ... who spoke for millions when he tweeted, "A little bit of my youth just died."

Elijah Wood, Boy George, and Rosie O'Donnell also weighed in online ... check out some of the Twibutes.

R.I.P Davy Jones!

— boygeorge (@BoyGeorge) February 29, 2012

davey jones .....http://www.youtube.com/watch?v=5qtW1jAwZgUsad- bobby sherman - david cassidy - my tiger beat pin up boys

— Rosie O'Donnell (@Rosie) February 29, 2012

Listen to "She" and "Daydream Believer", Davy Jones has passed. Very sad news.

— Elijah Wood (@woodelijah) February 29, 2012

Davy Jones of the Monkees is dead. He was 66 years old. A little bit of my youth just died

— Al Roker (@alroker) February 29, 2012

He was the original celebrity high school prom-crasher. Love you Davy RT @questlove damn. Davy Jones is gone. I loved the #Monkees

— Seth Green (@SethGreen) February 29, 2012

Davy Jones and The Monkeees were such an important part of my childhood...I'm speechless...

— Melissa Gilbert (@MelissaEGilbert) February 29, 2012

RIP Davy Jones. Marcia had good taste.

— Andy Cohen (@BravoAndy) February 29, 2012

So sad-I was just at an event w/him. RT @HarveyLevinTMZ: Monkees singer Davy Jones dead at 66 #rip #davyjones #monkees tmz.com/2012/02/29/dav…

— Shannon Elizabeth (@ShannonElizab) February 29, 2012

damn. Davy Jones is gone. i loved the Monkees

— Questo of The Roots (@questlove) February 29, 2012

A Daydream ends: DAVY JONES DIES - tmz.com/2012/02/29/dav… His life was a big barrel of win (& Monkees). Marcia Brady will be inconsolable...

— KevinSmith (@ThatKevinSmith) February 29, 2012