What is Twitch?

FILE - This Saturday, Nov. 4, 2017, file photo shows the logo of live streaming video platform Twitch at the Paris games week in Paris. The attacker who killed two people in a shooting at a German synagogue live-streamed his assault on Twitch, a video service owned by Amazon. It was one of the first violent attacks streamed on Twitch, which is best known for letting people watch others play competitive video games. (AP Photo/Christophe Ena, File)

SEATTLE -- The attacker who killed two people in a shooting at a German synagogue earlier this month livestreamed the assault on Twitch, a video service owned by Amazon. It was one of the first violent attacks streamed on the service, which is best known for letting people watch others play competitive video games.

Here's what you need to know about Twitch.

Watching people play

Twitch is a site where people can livestream video games as they're playing, usually providing tips and commentary while others watch. The platform has boomed in popularity over the past few years. It played a key role in boosting the spread of "esports," or competitive video gaming.

Popular Twitch gamers can have millions of followers. The platform itself has more than 100 million monthly users.

Non-video game violence

Twitch said it found and took down the video with "urgency" and said it was "shocked and saddened by the tragedy." But the video is reportedly 36 minutes long.

Twitch said only about five people saw the livestream, but 2,200 viewed the finished recording of the video for the next half-hour before Twitch took it down. The video has also spread to other corners of the internet.

Twitch has faced other complaints in the past -- largely from female gamers who say they have been harassed, echoing an undercurrent of sexism that has long been an issue in gaming culture. Twitch has policies in place against hateful conduct and harassment and asks users and streamers to report inappropriate conduct.

The attack in Germany echoed a March assault in Christchurch, New Zealand. Then, the perpetrator livestreamed his attack on Facebook. The social network subsequently said it was working on restricting some users with previous rules violations from using Facebook Live. It also continues to work on artificial intelligence technology that can detect violent videos to prevent them from being re-shared.

It's hard to guess why Twitch was chosen this time, said Hannah Bloch-Wehba, a law professor at Drexel University. She said attempts by Twitter and Facebook to crack down on such material may have discouraged people from trying to stream violence there.

A growing problem

Internet companies have pledged after each attack to work on preventing such livestreams from happening again, including by advancing artificial intelligence to catch such videos. Bloch-Wehba is skeptical that those efforts alone will entirely halt the problem.

There's an argument that the big companies should be doing a lot more, said Justin Brookman, the director of consumer privacy and technology policy for Consumer Reports.

"Companies definitely need better legal incentives to police their platforms from abuse," he said.

Twitch said it found evidence the video was shared in messaging services outside the platform. It shared a forensics fingerprint of the video, or hash, with other tech companies to help them identify copies spreading on their own services.

The Christchurch shooting earlier this year was live on Facebook for 17 minutes -- and Facebook said none of the 200 so people who watched reported it to moderators. This raised questions about Facebook's reliance on user reporting rather than proactive detection of objectionable content.

Facebook has already been programming its artificial intelligence systems to detect things like nudity and known materials from extremist groups such as ISIS. It's been working to expand that to other types of images and videos. For instance, Facebook said last month that it will use first-person videos taken during police firearm training sessions to teach its AI to detect livestreams of real-world shootings.

The company has also been trying to rein white nationalist ideology on its sites. Since March, for instance, people who search for terms associated with white supremacy on Facebook are directed to the website for Life After Hate, a group created to help people leave the violent far-right.

How Twitch grew

Seattle tech giant Amazon bought Twitch for $970 million in 2014. It had already attracted a critical mass of video-game streamers and remains the primary place to watch gamers play.

Competitors such as Microsoft-owned Mixer and Google-owned YouTube have been angling for a slice of that business. Mixer even poached one of Twitch's star gamers, a Fortnite player known as Ninja, in August.

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