Las Vegas shooting brought Twitter its saddest day ever

The mood on Twitter after the tragedy was lower than following the Orlando nightclub shooting and Donald Trump's election.

Steven Musil Night Editor / News
Steven Musil is the night news editor at CNET News. He's been hooked on tech since learning BASIC in the late '70s. When not cleaning up after his daughter and son, Steven can be found pedaling around the San Francisco Bay Area. Before joining CNET in 2000, Steven spent 10 years at various Bay Area newspapers.
Expertise I have more than 30 years' experience in journalism in the heart of the Silicon Valley.
Steven Musil
2 min read
Mass Shooting At Mandalay Bay In Las Vegas Leaves At Least 50 Dead

Mourners attend a candlelight vigil in Las Vegas for the victims of Sunday night's mass shooting.

Drew Angerer/Getty Images

The mass shooting in Las Vegas earlier this week brought the mood on Twitter to its lowest level ever Monday.

The Hedonometer, a tool that measures the happiness of millions of Twitter users based on their posts, showed an average happiness level of 5.77 after news of the massacre began spreading. The mass shooting claimed the lives of 59 people and left more than 500 injured when a gunman on the 32nd floor of a Las Vegas Strip casino started firing on concert-goers at an outdoor music festival below.

The previous record low on the Hedonometer was 5.84, recorded last year after another shooting killed 49 people at an Orlando, Florida nightclub. Twitter's third-saddest recorded day was Nov. 9, 2016, the day after Donald Trump was elected president of the US. The happiness level on that day was 5.87.

The tool, which has been tracking the mood of Twitter since 2008, was created by Peter Dodds and Chris Danforth, a mathematician and computer scientist, respectively, from the Advanced Computing Center at the University of Vermont. The tool measures mood through a system that assigns a value to words on a scale of one to nine based on their emotion. 

For example, "I feel extremely sad" garners a one, while "I am extremely happy" gets a nine.

Solving for XX: The industry seeks to overcome outdated ideas about "women in tech."

It's Complicated: This is dating in the age of apps. Having fun yet? These stories get to the heart of the matter.