Thank you for bearing with us," Facebook said in atweet.

The three social networks – all owned by Facebook – started having issues around 11:40 a.m.

ET, according toDown Detector, a crowdsourced website that tracks online outages.

“Similar messageswere shared on the Twitter accounts for Facebook andFacebook Messenger.

Sincere apologies to everyone impacted by outages of Facebook powered services right now.

Facebook is deeply enmeshed in global infrastructure and the outage disrupted communications for the company’s billions of users.

The website and its services are used for everything from casual chatting to business transactions.

It isn’t immediately clear what caused the issue for the three properties.

“Facebook and its sites had effectively disconnected themselves from the Internet,” Cloudflare concluded.

Specifically, the updates cut off connection routes to Facebook’s DNS servers.

Instagram CEO Adam Mosseri said in a tweet that it felt like a “snow day.”

“Sometimes more people than usual use Twitter,” Twitter tweeted Monday afternoon.

“We prepare for these moments, but today things didn’t go exactly as planned.”

Sometimes more people than usual use Twitter.

We prepare for these moments, but today things didnt go exactly as planned.

Some of you may have had an issue seeing replies and DMs as a result.

This has been fixed.

The outage cost Facebook an estimated $60 million in forgone revenue as of 1 p.m. PT/4 p.m.

ET, according toFortuneandSnopes.

The outlets then used those numbers to calculate revenue loss based on how long the outage has lasted.

(Shares of Twitter and Snap were both off more than 5%.)

The slide in Facebook stock weighed on CEOMark Zuckerberg’snet worth, which dropped to $121.6 billion.

His net worth is now less thanMicrosoftco-founderBill Gatesand is the fifth wealthiest person in the world, according toBloomberg.

The whistleblower, a former Facebook product engineer named Frances Haugen, is scheduled totestify to Congresson Tuesday.

She detailed some of her allegations ina televised interviewon Sunday.

in response to tweets suggesting Facebook’s domain was for sale.

This isn’t the first timeFacebookhas suffered from a lengthy outage.

CNET’s Carrie Mihalcik and Stephen Shankland contributed to this report.