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Illustration: Sarah Grillo/Axios

The mass adoption of wireless headphones and smart devices, combined with people being home all day and not in public spaces, has created a boom for audio — and every big media and tech company is scrambling to claim a piece of it.

Why it matters: The audio boom is milestone for accessibility and a boon to content creators, but it also presents new challenges for content moderation.

  • "The intimacy of audio could be tailor-made for our shelter in place, contact-free lives," says John Lustyan, Founder & Managing Partner of illum, a media consultancy, told Axios.

Driving the news: Almost overnight, audio chat features have become top-of-mind for Big Tech giants, looking to edge out the up-and-coming social chat app Clubhouse.

Be smart: The social media audio boom mostly centers around ephemeral conversations. Users can open Clubhouse or Twitter (Spaces) and drop in on conversations that are meant to be casual, and not recorded to be listened to later.

In the workplace, the audio boom looks a bit different.

  • Those products, like audio messaging platform Yac, are designed to be asynchronistic, meaning users are meant to listen to pre-recorded messages from colleagues at their leisure.
  • Workplace companies, like Slack, are trying to figure out ways to integrate these types of audio tools into their mostly text-based products. Most video conferencing companies offer users the ability to dial in without having to use video.

By the numbers: The audio content and software boom is happening as new hardware makes listening and voice commands much easier.

  • For the first time ever, wireless headphone and earbud shipments surpassed wired headphones and earbuds last year, according to data from the Consumer Technology Association. Nearly 40% of the U.S. population uses voice assistants, per eMarketer. Roughly a quarter of the adult population own a smart speaker.
  • Music, audiobook and podcast services are expected to reach $10 billion in revenue, up 19% over last year, per CTA. Audiobooks are the fastest-growing sector within the book publishing industry, according to The Association of American Publishers.
  • Spotify says it now hosts 2.2 million podcasts, up from 700,000 in 2019.
  • The audio boom has triggered a mergers and acquisitions frenzy, especially around podcast companies.

The big picture: Audio presents enormous opportunities for brands and content creators to reach people in a more accessible way — when they're on-the-go or using their eyes for some other activity. But the scale of audio conversations will make it very difficult to fact-check conversations or stop bullying and harassment in real-time.

  • Already, we're seeing some of these issues play out. Clubhouse — which requires an invite to access — is reportedly already being blocked in China, and it's starting to face allegations that the platform isn't adequately built to stop harassment.
  • Facebook said Thursday on a call with reporters that it's exploring ways to monitor audio content, as well as any type of mixed media content, for harmful or illegal things that violate its rules.

Go deeper:

Go deeper

DOJ declines to defend Mo Brooks in Capitol riot lawsuit

Rep. Mo Brooks during a June news conference on Capitol Hill. Photo: Anna Moneymaker/Getty Images)

The Department of Justice declined late Tuesday to represent Rep. Mo Brooks in a civil lawsuit against the Georgia congressman concerning the Capitol riot.

Why it matters: Brooks had argued he should have immunity in the suit, filed by Rep. Eric Swalwell (D-Calif.) against him, former President Trump, his son Donald Trump Jr. and lawyer Rudy Giuliani over the insurrection. He said he was acting as a government employee when he spoke at a rally before the insurrection.

Updated 1 hour ago - Sports

Katie Ledecky wins gold in first women's 1500m freestyle

Team USA's Katie Ledecky celebrates after winning the final of the women's 1,500m freestyle swimming event during the Tokyo 2020 Olympic Games at the Tokyo Aquatics Centre in Tokyo on Wednesday. Photo: Attila Kisbenedek/AFP via Getty Images)

Katie Ledecky took home the Olympic gold medal in the women's 1,500-meter freestyle swimming race Tuesday evening, becoming the first female swimmer to win the newly added division. Team USA's Erica Sullivan won silver.

Of note: The Tokyo Games mark the first time that the long-distance race has been open to women, and Ledecky paid tribute to her predecessors after the race. "I just think of all the great U.S. swimmers who didn’t have a chance to swim that event," she said on NBC.

Updated 2 hours ago - Sports

Olympics dashboard

Katie Ledecky celebrates with teammate Erica Sullivan after winning the women’s 1500m freestyle final. Photo: Tom Pennington/Getty Images

🚨: Katie Ledecky wins gold in first women's 1500m freestyle

🤸🏾‍♀️: Simone Biles pulls out of gymnastics team finals, citing her mental health

🎾: "This one sucks more than the others," Naomi Osaka says on upset loss

⚽️: USA women's soccer ties Australia, propelling them to the quarterfinals

🏊‍♀️: Teen swimmer Lydia Jacoby wins first U.S. women's Tokyo Games gold

👟: World Athletics president supports reviewing marijuana rules in doping

🏄‍♀️: American Carissa Moore wins first-ever women's Olympic gold in surfing

Go deeper: Full Axios coverage - Medal tracker