• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
Tech

Facebook outage sends millions of new users to Signal and Telegram

By
Vlad Savov
Vlad Savov
and
Bloomberg
Down Arrow Button Icon
October 5, 2021, 4:56 AM ET

Signal and Telegram, two private messenger apps, saw downloads and user sign-ups soar during the extended downtime of Facebook Inc.’s network of apps and services.

Millions of new users joined the Edward Snowden-endorsed Signal on Monday, it said on Twitter. Telegram, whose functionality closely mirrors that of WhatsApp, surged 55 places to top the U.S. iPhone download chart, according to Sensor Tower.

Facebook suffered a six-hour outage that spanned its WhatsApp messenger, the main social network and photo-sharing app Instagram, shutting out many of its 2.7 billion global users. The situation idled some of the company’s employees and prompted a public apology from Chief Executive Officer Mark Zuckerberg.

Facebook’s loss turned into a gain for other social media. Twitter Inc.’s network stayed online, with Chief Executive Officer Jack Dorsey tweeting his endorsement of Signal as a suitable WhatsApp alternative and amplifying Snowden’s urging of his followers to move away from the Facebook-owned app. Thousands of rooms on audio-chat app Clubhouse had people talking about the outage, a spokeswoman for the service said, adding that all its main metrics rose.

Signal’s focus on privacy — expressed in its policy to not collect any data on its users and thus avoid situations where governments may pressure it to disclose personally identifiable information — has made it a favorite for secure communications. Telegram has also historically added millions of users in the wake of major WhatsApp outages.

Signal is WhatsUp

🆙 https://t.co/zpRrxf9qKP https://t.co/T23l7Ih6NQ

— jack (@jack) October 4, 2021

More tech coverage from Fortune:

  • Why Instacart’s new CEO is also launching a women’s health startup
  • Beijing’s crackdown on teen gamers is about more than screen time
  • She ran Bumble’s IPO while being treated for breast cancer. Now she’s becoming a CEO
  • Commentary: Historically Black colleges can’t solve tech’s diversity problem alone
  • James Dean may be resurrected for a new film, decades after he died

Subscribe to Fortune Daily to get essential business stories straight to your inbox each morning.

About the Authors
By Vlad Savov
See full bioRight Arrow Button Icon
By Bloomberg
See full bioRight Arrow Button Icon

Latest in Tech

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Leadership
  • Success
  • Tech
  • Asia
  • Europe
  • Environment
  • Fortune Crypto
  • Health
  • Retail
  • Lifestyle
  • Politics
  • Newsletters
  • Magazine
  • Features
  • Commentary
  • Mpw
  • CEO Initiative
  • Conferences
  • Personal Finance
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map

Latest in Tech

A group of three robots waiving hello to the audience from a stage.
AIEye on AI
Google researchers unlock some truths about getting AI agents to actually work
By Jeremy KahnDecember 16, 2025
9 minutes ago
AIthe future of work
IBM, AWS veteran says 90% of your employees are stuck in first gear with AI, just asking it to ‘write their mean email in a slightly more polite way’
By Marco Quiroz-GutierrezDecember 16, 2025
16 minutes ago
Photo of Elon Musk
Startups & VentureSpaceX
A SpaceX IPO could be the largest public offering of all time—and Elon Musk’s biggest headache
By Jessica MathewsDecember 16, 2025
2 hours ago
AIOpenAI
OpenAI releases new image model as it races to outpace Google’s Nano Banana amid company Code Red
By Sharon GoldmanDecember 16, 2025
3 hours ago
Arnab
AIBrainstorm AI
Accenture exec gets real on transformation: ‘the data and AI strategy is not a separate strategy, it is the business strategy’
By Nick LichtenbergDecember 16, 2025
3 hours ago
Matt Garman speaks on stage in front of a screen showing colorful concentric circles on a black background.
Future of WorkAmazon
AWS CEO says replacing young employees with AI is ‘one of the dumbest ideas’—and bad for business: ‘At some point the whole thing explodes on itself’
By Sasha RogelbergDecember 16, 2025
4 hours ago

© 2025 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.


Most Popular

placeholder alt text
Success
'I had to take 60 meetings': Jeff Bezos says 'the hardest thing I've ever done' was raising the first million dollars of seed capital for Amazon
By Dave SmithDecember 15, 2025
1 day ago
placeholder alt text
Success
Meetings are not work, says Southwest Airlines CEO—and he’s taking action, by blocking his calendar every afternoon from Wednesday to Friday 
By Preston ForeDecember 15, 2025
1 day ago
placeholder alt text
Success
Bad luck, six-figure earners: Elon Musk warns that money will 'disappear' in the future as AI makes work (and salaries) irrelevant
By Orianna Rosa RoyleDecember 15, 2025
1 day ago
placeholder alt text
Personal Finance
Current price of silver as of Monday, December 15, 2025
By Joseph HostetlerDecember 15, 2025
1 day ago
placeholder alt text
Future of Work
The job market is so bad, people in their 40s are resorting to going back to school instead of looking for work
By Sydney LakeDecember 16, 2025
13 hours ago
placeholder alt text
North America
Ford writes down $19.5 billion as it pivots electric Lighting line of vehicles
By Sasha RogelbergDecember 15, 2025
23 hours ago