Signal and Telegram messaging apps are seeing a sudden increase in demand after larger rival WhatsApp's updated terms of service raised eyebrows on social media.
WhatsApp, which uses Signal's encryption technology, laid out fresh terms on Wednesday, asking users to agree to let owner Facebook Inc and its subsidiaries collect user data, including their phone number and location.
Some privacy activists questioned the "accept our data grab or get out" move on Twitter, and suggested users to switch to apps like Signal and Telegram.
Signal's popularity shot up further on Thursday after it was endorsed by Elon Musk, who has one of the most-followed accounts on Twitter, and by the micro-blogging site's top boss Jack Dorsey.
More than 100,000 users installed Signal across the app stores of Apple and Google in the last two days, while Telegram picked up nearly 2.2 million downloads, according to data analytics firm Sensor Tower.
New installs of WhatsApp fell 11% in the first seven days of 2021 compared with the prior week, but that still amounted to an estimated 10.5 million downloads globally, Sensor Tower said.
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