Stephens is believed to have videotaped his actions and published it on Facebook, along with another video threatening to kill others and claiming he had already killed 13 people. As the vehicle was spinning from the impact, Stephens pulled out a pistol and shot himself in the head.
Zuckerberg made his comments at an annual conference for developers and businesses who create apps and services on Facebook.
The worker delayed delivering the fries to keep him there, and Stephens eventually sped off without receiving them, the report said.
Facebook has also been heavily criticised for its management and removal of illegal and extreme content on the site, as well as the sharing of so-called fake news stories.
The McDonald's employees kept their cool once recognizing Steve Stephens as the suspect wanted for killing an elderly man and then posting the clip of the cold-blooded shooting on Facebook. A few minutes after that, he went live and confessed.
Accused "Facebook killer" Steve Stephens in an image from this weekend.
According to a timeline of events pieced together by police and Facebook, Stephens posted a video on Sunday afternoon saying he meant to kill, and followed up two minutes later with video of Godwin's shooting.
In addition to the Cleveland police murder investigation of Robert Godwin, Pennsylvania State Police will do their own investigation into the death Steve Stephens. He said that he was "pretty sure he figured out that we were on to him".
NCAA expected to announce tournament host sites today
HB2 ordered that people at a government-run facility must use bathrooms that correspond to the gender on their birth certificate. HRC envisions a world where LGBTQ people are embraced as full members of society at home, at work and in every community.
Lane said the last time she talked to Stephens was Saturday night and he told her he had quit his job and was moving out of state.
Stephens, who had no prior criminal record, was not suspected in any other killings, Cleveland officials said.
Despite Stephen's death, authorities say that they are continuing to investigate. Detectives spoke with the suspect on Sunday by cellphone and tried to persuade him to surrender, police said.
Similar incidents have been posted on Facebook before.
Cleveland police are saying the video never should have been shared.
"We know we need to do better", Justin Osofsky, VP of global operations at Facebook, wrote in a post Monday.