Guy Rosen @guyro

CISO @ Meta, overseeing our work on safety & security Joined July 2008

Tweets

346
Followers

21K
Following

698
Likes

71

Mark Zuckerberg @finkd

3 months ago

(1) Today we're releasing Muse Spark 1.1 -- a strong agentic and coding model at a very low price. It's available through our new Meta Model API and in Meta AI.

5K 4K 45K 23.7M 7K

View Details

We’ve taken part in a major operation to disrupt scam networks in SE Asia, leading to the arrests of 63 suspected scammers & the removal of over 1.4 million accounts on Facebook & Instagram. Taking down sophisticated global criminal networks requires industry & law enforcement to work together. This successful operation brought together @Meta, @Microsoft, @Coinbase, @Starlink, with @DOJ's Scam Center Strike Force, the @FBI, and global law enforcement. These syndicates exploit millions through romance scams, investment fraud, and forced labor, with their tactics constantly evolving across platforms and borders. That's exactly why this sort of cross-sector collaboration matters: together, industry & law enforcement can disrupt these networks faster. Grateful to @USAttyPirro for her leadership and @FBIDirectorKash and his team for bringing these criminals to justice. about.fb.com/news/2026/06/l…

FBI Director Kash Patel @FBIDirectorKash

4 months ago

63 arrests, millions of dollars in frozen cryptocurrency, and the removal of more than a million scam-related online accounts! Just cops being allowed to be cops! Thank you @Meta for your partnership in taking these thugs down. This is just the beginning!

595 2K 7K 564K 135

87 466 3K 247K 75

View Details

Guy Rosen @guyro

5 months ago

Sharing work from our cryptography and security teams - today we're publishing Meta's post-quantum cryptography migration approach, lessons learned, and a new "PQC Migration Levels" framework. Take a look: engineering.fb.com/2026/04/16/sec…

23 0 6 2K 1

View Details

Guy Rosen @guyro

11 months ago

AI Agents are already transforming the industry, but they also introduce novel security risks. To make AI agents more secure, our team developed a practical framework, the “Agents Rule of Two” - a practical way to reduce AI security risks: ai.meta.com/blog/practical…

22 3 13 6K 4

View Details

Guy Rosen @guyro

a year ago

We’re testing new Community Notes features at Meta: Anyone can now request a note or rate if a note is helpful - Users get notified when posts they’ve interacted with receive a Community Note - 70,000+ contributors have written 15,000+ notes (6% published). Learn more or join: meta.com/technologies/c…

16 7 16 10K 6

View Details

Guy Rosen @guyro

a year ago

Heads up, we're also changing the format of our Adversarial Threat Report and will publish the updated report next quarter. Stay tuned for more insights into our ongoing efforts to protect our platforms. (4/4)

6 0 2 782 0

View Details

Guy Rosen @guyro

a year ago

We’re also providing an update on our efforts to combatting illicit drugs and supporting our users in prevention, treatment and recovery. We've invested in a dedicated investigative team, deployed new detection methods, and launched prevention campaigns to protect at-risk youth from recruitment. (3/4)

8 0 2 969 1

View Details

Guy Rosen @guyro

a year ago

Sharing Meta’s Q2 2025 transparency reports and other integrity updates. transparency.meta.com/integrity-repo… (1/4)

21 2 10 13K 2

View Details

Guy Rosen @guyro

3 years ago

Looking forward to more research in this area to help our industry build stronger/safer AI systems. More broadly, malicious groups keep evolving tactics - that’s why we keep examining our threat disruption strategies and how we can improve them.

12 0 5 2K 1

View Details

Guy Rosen @guyro

3 years ago

👉AI: we joined peers for a first-ever public Red Team Challenge at @defcon this month. Over 2K security researchers and students stress-tested 8 LLMs to help probe for bugs and unintended behaviors – from bad math to misinformation to providing bad user security practices.

6 0 1 3K 0

View Details

Guy Rosen @guyro

3 years ago

Today we published our quarterly integrity & security reports, and shared an under-the-hood view into our defense strategy and how we build it into products. about.fb.com/news/2023/08/i…

73 4 9 9K 2

View Details

Nick Clegg @nickclegg

3 years ago

Today, academic journals Science and Nature have published four landmark research papers to better understand the impact of Facebook and Instagram on key political attitudes and behaviors during the US 2020 election cycle. about.fb.com/news/2023/07/r…

11 7 18 15K 10

View Details

Guy Rosen @guyro

3 years ago

3️⃣ These reports show how persistent these threats can be. Malicious groups count on the industry working in silos while they target people across services. That’s why it’s great to see teams working together to protect people, share threat research and scale this security work.

3 0 3 1K 0

View Details

Guy Rosen @guyro

3 years ago

2️⃣ We took action against malware targeting businesses across the internet, including browser extensions posing as ChatGPT and other GenAI tools. We shared findings with peers and rolled out new security features to help protect against malicious tactics. about.fb.com/news/2023/05/h…

5 2 4 4K 0

View Details

Guy Rosen @guyro

3 years ago

🧵Sharing Meta's Q1 security and integrity reports. As part of our quarterly reporting, we just shared updates on our work to combat a range of threats globally, including covert influence operations, cyber espionage and malware campaigns. about.fb.com/news/2023/05/m…