The outage was the second blow to the social media giant in as many days after a whistleblower on Sunday accused the company of repeatedly prioritising profit over clamping down on hate speech and misinformation.
As the world flocked to competing apps such as Twitter and TikTok, shares of Facebook fell 4.9 per cent, their biggest daily drop since last November, amid a broader selloff in technology stocks on Monday.
Shares rose about half a percent in after-hours trade following resumption of service.
"To every small and large business, family, and individual who depends on us, I'm sorry," Facebook chief technology officer Mike Schroepfer tweeted, adding that it "may take some time to get to 100 per cent".
"Facebook basically locked its keys in its car," tweeted Jonathan Zittrain, director of Harvard's Berkman Klein Center for Internet & Society.
Twitter on Monday reported higher-than-normal usage, which led to some issues in people accessing posts and direct messages.
In one of the day's most popular Tweets, video streaming company Netflix shared a meme from its new hit show Squid Game captioned "When Instagram & Facebook are down," that showed a person labeled "Twitter" holding up a character on the verge of falling labelled "everyone".
Inside a Facebook group for ad buyers, one member wisecracked after service returned that "lots of people searched today 'how to run google ads for clients'".
Facebook, which is the world's largest seller of online ads after Google, was losing about US$545,000 in US ad revenue per hour during the outage, according to estimates from ad measurement firm Standard Media Index.
Past downtime at Internet companies has had little long-term affect on their revenue growth, however.
Facebook's services, including consumer apps such as Instagram, workplace tools it sells to businesses and internal programmes, went dark noon Eastern time (12am, Tuesday, Singapore time). Access started to return around 5.45pm.
Soon after the outage started, Facebook acknowledged users were having trouble accessing its apps but did not provide any specifics about the nature of the problem or say how many users were affected.
The error message on Facebook's webpage suggested an error in the Domain Name System (DNS), which allows web addresses to take users to their destinations. A similar outage at cloud company Akamai Technologies Inc took down multiple websites in July.
Facebook's engineering team apologised as the apps started to come back online.
"To the huge community of people and businesses around the world who depend on us: we're sorry," the team tweeted on Monday.
"We’ve been working hard to restore access to our apps and services and are happy to report they are coming back online now. Thank you for bearing with us."
"Apologies to everyone who hasn’t been able to use WhatsApp today," tweeted the messaging app. "We’re starting to slowly and carefully get WhatsApp working again.
"Thank you so much for your patience."
On Sunday, Frances Haugen, who worked as a product manager on the civic misinformation team at Facebook, revealed that she was the whistleblower who provided documents underpinning a recent Wall Street Journal investigation and a US Senate hearing last week on Instagram's harm to teen girls.
Haugen was due to urge the same Senate subcommittee on Tuesday to regulate the company, which she plans to liken to tobacco companies that for decades denied that smoking damaged health, according to prepared testimony seen by Reuters.
https://news.google.com/__i/rss/rd/articles/CBMiW2h0dHBzOi8vd3d3LmNoYW5uZWxuZXdzYXNpYS5jb20vYnVzaW5lc3MvZmFjZWJvb2staW5zdGFncmFtLXdoYXRzYXBwLW91dGFnZS02LWhvdXJzLTIyMjIxNzHSAQA?oc=5
2021-10-05 02:29:00Z
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