Friends and former colleagues of Hollywood actor Robin Williams have shared their grief on social media, posting heartfelt condolences to his family and memories of his prolific career.

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Robin Williams made the world a little bit better. RIP.

— Steve Carell (@SteveCarell) August 11, 2014

Robin Williams made the world laugh & think. I will remember & honor that. A great man, artist and friend. I will miss him beyond measure.

— Kevin Spacey (@KevinSpacey) August 12, 2014

RIP mr Williams – beyond great talent -such a kind and lovely person — John Cusack (@johncusack) August 11, 2014

We mourn the loss of our friend Robin Williams, who always made us laugh and smile. pic.twitter.com/UOY8LTjVRA — Sesame Street (@sesamestreet) August 11, 2014

I could not be more stunned by the loss of Robin Williams, mensch, great talent, acting partner, genuine soul. — Steve Martin (@SteveMartinToGo) August 11, 2014

I can’t believe the news about Robin Williams. He gave so much to so many people. I’m heartbroken. — Ellen DeGeneres (@TheEllenShow) August 11, 2014

Robin Williams, a gift to the world. So very very sad. My love and condolences to his family. He is awake, and we are all still sleeping. — sia (@Sia) August 11, 2014

Oh Robin…Our hearts are broken. Rest in peace darling. We loved you. — Goldie Hawn (@goldiehawn) August 11, 2014

It’s the mark of a true artist. I never knew him but I’m heartbroken by his passing. RIP Robin Williams. — Jesse Tyler Ferguson (@jessetyler) August 11, 2014

He taught me to care about everyone on a show. From top to bottom he took time for all. A gr8 talent. Big loss 🙁 pic.twitter.com/w1M6j5jHxu — Fran Drescher (@frandrescher) August 12, 2014

Very sad, very upset, very glad I did not have to hear about this though Twitter. Probably going to be taking some time off it for a while.

— Mara Wilson (@MaraWritesStuff) August 11, 2014