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Will Cathcart Profile picture
Will Cathcart
@wcathcart
Head of @WhatsApp at @Meta
Feb 10, 2023 • 10 tweets • 3 min read
This is a really important article from @DarrenLoucaides @WIRED about Telegram. If you think Telegram is secure, you should read this article and understand the truth - especially before you use it for anything private.

Some really important points: Telegram is not end-to-end encrypted by default and offers no e2ee for groups. From the article: “Telegram has the capacity to share nearly any confidential information a government requests”
Nov 3, 2022 • 4 tweets • 2 min read
Communities on @WhatsApp is starting to roll out globally! With Communities admins can connect related groups for their organizations, neighborhoods, and workplaces. To get started tap on the brand new Communities tab. Check it out: We’re also adding more great features: polls, 32 person video calls, and groups with up to 1024 people. Like reactions, larger file sharing, and admin delete - we think these features will be particularly helpful for Communities but are available in any group!
Aug 9, 2022 • 4 tweets • 1 min read
Three great new privacy features for @WhatsApp users coming soon: You'll be able to leave group chats without having to tell everyone. Only the admins will be notified. Almost like leaving a party quietly and only informing the host 😀.
Jul 11, 2022 • 7 tweets • 2 min read
Reminder to @WhatsApp users that downloading a fake or modified version of WhatsApp is never a good idea. These apps sound harmless but they may work around WhatsApp privacy and security guarantees. A thread: Recently our security team discovered hidden malware within apps – offered outside of Google Play - from a developer called “HeyMods” that included "Hey WhatsApp" and others.
Apr 14, 2022 • 11 tweets • 3 min read
Today we’re very excited to share our vision for a feature we’re calling WhatsApp Communities. This is new functionality we’re building to support the many organizations that use WhatsApp to communicate in a private and secure way. We’ve heard from many workplaces, non-profits, and local organizations that have been using WhatsApp for their private communication, and there’s a lot we can improve to make WhatsApp work better for groups like these. Image
Oct 16, 2021 • 11 tweets • 2 min read
This paper is definitely worth reading. It's from some of the leading minds on computer security and it goes into great detail on why client side scanning (CSS) -- which @WhatsApp opposes -- would be very dangerous for us all.

arxiv.org/abs/2110.07450 They explain in clear terms the many problems with client side scanning proposals, concluding the security risks they would create for everyone would make "us all less safe and less secure."
Aug 6, 2021 • 13 tweets • 3 min read
I read the information Apple put out yesterday and I'm concerned. I think this is the wrong approach and a setback for people's privacy all over the world.

People have asked if we'll adopt this system for WhatsApp. The answer is no. Child sexual abuse material and the abusers who traffic in it are repugnant, and everyone wants to see those abusers caught.
Jul 18, 2021 • 8 tweets • 4 min read
This groundbreaking reporting from @Guardian, @WashingtonPost, and many others demonstrates what we and others have been saying for years: NSO’s dangerous spyware is used to commit horrible human rights abuses all around the world and it must be stopped.
theguardian.com/world/2021/jul… Human rights defenders, tech companies and governments must work together to increase security and hold the abusers of spyware accountable. Microsoft was bold in their actions last week blogs.microsoft.com/on-the-issues/…
Jan 8, 2021 • 10 tweets • 3 min read
I've been watching a bunch of discussion this week about the privacy policy update we’re in the process of making @WhatsApp and wanted to share some thoughts.

Thread 👇 I want to share how committed everyone @WhatsApp is to providing private communication for two billion people around the world. At our core, that’s the ability to message or call loved ones freely protected by end-to-end encryption and that’s not changing.
Mar 11, 2020 • 17 tweets • 7 min read
This morning the U.S. Senate Judiciary Committee held a hearing on the "EARN IT" Act. While not directly mandating a backdoor, as written, this act would form a commission that could have the power to require services like @WhatsApp to stop offering end-to-end encryption. 1/ Absent clear protections for encryption, EARN IT has the potential to make people less safe, not more, by reducing the security of the over 2 billion people who use WhatsApp to communicate, not to mention all the other encrypted services as well. 2/