Neeraj Agrawal, a spokesman for a cryptocurrency think tank, has typically used the encrypted messaging app Signal to chat with privacy-minded colleagues and peers. So he was surprised on Monday when the app alerted him to two new users: Mom and Dad.
â€œSignal still had a subversive shine to it,â€� said Mr. Agrawal, 32. â€œNow my parents are on it.â€�
On Telegram, another encrypted messaging app, Gavin McInnes, founder of the far-right Proud Boys group, had just announced his return. â€œMan, I havenâ€™t posted here in a while,â€� he wrote on Sunday. â€œIâ€™ll be posting regularly.â€�
And on Twitter, Elon Musk, the billionaire entrepreneur, also weighed in last week with a two-word endorsement: â€œUse Signal.â€�
Over the past week, tens of millions of people have downloaded Signal and Telegram, making them the two hottest apps in the world. Signal allows messages to be sent with â€œend-to-end encryption,â€� meaning no one but the sender and receiver can read its contents. Telegram offers some encrypted messaging options, but is largely popular for its group-based chat rooms where people can discuss a variety of subjects.
Their sudden jump in popularity was spurred by a series of events last week that stoked growing anxiety over some of the big tech companies and their communication apps, like WhatsApp, which Facebook owns. Tech companies including Facebook and Twitter removed thousands of far-right accounts â€” including President Trumpâ€™s â€” after the storming of the Capitol. Amazon, Apple and Google also cut off support for Parler, a social network popular with Mr. Trumpâ€™s fans. In response, conservatives sought out new apps where they could communicate.
At the same time, privacy worries rose over WhatsApp, which last week reminded users in a pop-up notification that it shares some of their data with its parent company. The notification set off a wave of anxiety, fueled by viral chain messages that falsely claimed that Facebook could read WhatsApp messages.
The result was a mass migration that, if it lasts, could weaken the power of Facebook and other big tech companies. On Tuesday, Telegram said it added more than 25 million users over the previous three days, pushing it to over 500 million users. Signal added nearly 1.3 million users on Monday alone, after averaging just 50,000 downloads a day last year, according to estimates from Apptopia, an app-data firm.
â€œWeâ€™ve had surges of downloads before,â€� said Pavel Durov, Telegramâ€™s chief executive, in a message on the app on Tuesday. â€œBut this time is different.â€�
Carl Woog, a spokesman for WhatsApp, said that usersâ€™ privacy settings had not changed and that rumors about what data is shared were largely unfounded.
â€œWhatâ€™s not changing is that private messages to friends and family, including group chats, will be protected by end-to-end encryption so that we cannot see them,â€� he said.
The rise of Telegram and Signal could inflame the debate over encryption, which helps protect the privacy of peopleâ€™s digital communications but can stymie the authorities in crime investigations because conversations are hidden.
Any move to the apps by far-right groups in particular has worried U.S. authorities, some of whom are trying to track the planning for what may become violent rallies on or ahead of the inauguration of President-elect Joseph R. Biden Jr. next week.
â€œThe proliferation of the encrypted platforms, where law enforcement canâ€™t even monitor the rhetoric, does allow groups that have an ill intent to plan behind the curtain,â€� said Louis Grever, head of the Association of State Criminal Investigative Agencies.
Capitol Riot Fallout
Telegram has been particularly popular for those on the far right because it mimics social media. So after Facebook and Twitter limited Mr. Trump on their services last week and other companies began pulling their support from Parler, far-right groups on Parler and other fringe social networks posted links to new Telegram channels and urged people to join them there.
In the four hours after Parler went offline on Monday, one Proud Boys group on Telegram gained over 4,000 new followers.
â€œDonâ€™t trust Big tech,â€� read a message on one Proud Boys group on Parler. â€œWe will need to find safer spaces.â€�
On Signal, a Florida-based militia group said on Monday that it was organizing its chats in small, city-by-city groups limited to a few dozen people each, according to messages seen by The New York Times. They warned one another not to let in anyone they did not personally know, to avoid law enforcement officials spying on their chats.
The flood of users to Telegram, which is based in Dubai, and Signal, which is based in Silicon Valley, goes far beyond just the American far right. Mr. Durov said that 94 percent of Telegramâ€™s 25 million new users came from Asia, Europe, Latin America, the Middle East and North Africa.
Most of Signalâ€™s new user adoption is coming from outside the United States. As of Wednesday, the company said it was the No. 1 app in 70 countries on iOS devices and in 45 countries on Android devices, with India being one of the biggest areas of new user growth. For both Signal and Telegram, new installations came from users in Indonesia, Mexico, Brazil and dozens of other countries, data from Apptopia shows.
Fears over WhatsAppâ€™s privacy policies have driven Telegram and Signalâ€™s popularity. While there was no meaningful change to how WhatsApp handles usersâ€™ data, people immediately interpreted the appâ€™s privacy notification last week to mean that it was infiltrating all kinds of personal information â€” like personal chat logs and voice calls â€” and sharing that data with businesses.
WhatsApp quickly said people were mistaken and that it could not see anything inside of encrypted chats and calls. But it was too late.
â€œThe whole world now seems to understand that Facebook is not building apps for them, Facebook is building apps for their data,â€� said Moxie Marlinspike, the founder and chief executive of Signal. â€œIt took this one small catalyst to push everyone over the edge of making a change.â€�
The fervor has been such that on Tuesday, Moses Tsali, a Los Angeles rapper, released a music video for his song, â€œHit Me On Signal.â€� And Mr. Muskâ€™s endorsement of Signal last week sent publicly traded shares of Signal Advance Inc., a small medical device maker, soaring from a roughly $50 million market value to more than $3 billion. (The company has no relation to the messaging app.)
Some world leaders have also urged people to join them on the apps. On Sunday, the Twitter account of President AndrÃ©s Manuel LÃ³pez Obrador of Mexico talked about his new group on Telegram. By Wednesday, it had nearly 100,000 members.
Eli Sapir, Apptopiaâ€™s chief executive, said that while peopleâ€™s concerns over Facebookâ€™s data collection were fair, WhatsApp actually uses more secure encryption than Telegram. â€œItâ€™s like going from something high in sugar to corn syrup,â€� he said, adding that Signal was the most secure of the three.
Meyi Alabi, 18, a student in Ibadan, Nigeria, said she was surprised this week when her mother invited her to join Signal. Her mother had downloaded the app upon urging from a friend worried about WhatsApp.
â€œI was in shock because she got it before me,â€� she said. â€œWe usually tell our parents about the new apps. Now all of a sudden weâ€™re the ones getting informed.â€�
Mr. Agrawal, the cryptocurrency worker, said his parents had long been active in several WhatsApp group chats with college friends and relatives back in India. He said they told him they joined Signal to follow many of those chats that were moving there, because some of the participants were worried about WhatsAppâ€™s new policy.
He said he knew the dangers of the WhatsApp policy were overstated but that much of the public doesnâ€™t understand how their data is being handled.
â€œThey hear those key things â€” data sharing, Facebook, privacy,â€� Mr. Agrawal said, â€œand thatâ€™s enough for them to say, I got to get off this.â€�
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