They paid tribute to video game streamer Byron Bernstein, known as Reckful, who died on Thursday.
Bernstein was a well-known and loved e-sports player and had 960,000 followers on the Twitch streaming site.
His brother Gary Bernstein confirmed that Reckful had committed suicide at the age of 31.
Twitch said that Reckful was a "streaming pioneer" and that he was "devastated" to hear of his death.
Bernstein had partly built his retinue by playing World Of Warcraft.
When his death was reported on Thursday evening, fans held virtual memorials within the game.
Before his death, he had worked to create his video game called Everland.
In January, he shared a YouTube video where he talked about his fight with depression and said he lost one of his brothers to suicide.
"Byron was someone who talked about his struggles to help make room for others at the same," Twitch said in a statement.
"As we process this loss, we must recognize that the stigma on mental health and treatment often prevents people from seeking and getting the help they need."
His partner, a player known as Becca, said - in a blog post - that Reckful was "fantastic".
"We need better support for those with mental needs. I remember Byron telling me he was traumatized when he appealed to the authorities to be at risk of suicide," he wrote.
"Anyone who knew him knew how scared and hit him. This can't be the way people think of the places that should keep them safe."
- For information and support on mental health and suicide, access the BBC Action Line.
