# Fabian Faessler

> security researcher

**Wikidata**: [Q105515839](https://www.wikidata.org/wiki/Q105515839)  
**Source**: https://4ort.xyz/entity/fabian-faessler

## Summary
Fabian Faessler is a German security researcher, computer scientist, and hacker, best known by his online alias **LiveOverflow**. He is the owner of Security Flag GmbH and operates a prominent educational YouTube channel focused on information security and the theoretical foundations of computer science. As of late 2025, his content has garnered over 93 million views and nearly one million subscribers.

## Biography
*   **Nationality:** Germany
*   **Known for:** Producing security research and educational content under the alias LiveOverflow.
*   **Employer(s):** Security Flag GmbH (Owner)
*   **Occupation:** Security Researcher, Computer Scientist, YouTuber, Hacker
*   **Gender:** Male
*   **Alias:** LiveOverflow

## Contributions
Fabian Faessler has established a significant presence in the information security sector through content creation and business ownership.
*   **Security Flag GmbH:** He is the owner of this entity, which serves as the corporate structure behind his professional activities. Contact emails associated with this entity include `fabian@securityflag.de` and `youtube+web@securityflag.de`.
*   **LiveOverflow Platform:** He developed and maintains `liveoverflow.com`, a website featuring a dedicated blog section for technical writing.
*   **YouTube Channel:** Under the handle **LiveOverflow** (Channel ID: `UClcE-kVhqyiHCcjYwcpfj9w`), he produces video content on hacking and computer science. The channel, started in March 2015, has accumulated over **65.6 million views** and approximately **930,000 subscribers** as of November 2025.
*   **Open Source & Security:** He maintains a public presence on GitHub and Keybase, providing a PGP public key fingerprint (`0766 42F9 6465 3FDE 55C1 2DFD 6680 43C6 AE81 288B`) for secure communication.

## FAQs

### What is Fabian Faessler's online alias?
Fabian Faessler is widely known by the nickname **LiveOverflow**. He uses this handle consistently across platforms including YouTube, Twitter, Instagram, Reddit, GitHub, and Bluesky.

### What company does Fabian Faessler own?
Fabian Faessler is the owner of **Security Flag GmbH**. This company serves as the operational entity for his work, handling business inquiries and channel management via official email addresses.

### How large is Fabian Faessler's audience?
As of November 2025, Fabian Faessler's YouTube channel has reached approximately **930,000 subscribers** and **65,619,587 total views**. He also has a verified Twitter account with over 107,000 followers as of August 2022.

### Where can Fabian Faessler be found on social media?
He is active on multiple platforms:
*   **YouTube:** @liveoverflow
*   **Twitter:** @liveoverflow (Verified)
*   **Bluesky:** @liveoverflow.bsky.social
*   **GitHub:** LiveOverflow
*   **Reddit:** u/liveoverflow
*   **Keybase:** liveoverflow

## Why They Matter
Fabian Faessler represents the intersection of rigorous computer science theory and practical security education. While many technology professionals focus solely on application, Faessler—classifying himself as a computer scientist—engages with the theoretical foundations of computation and the design of computational systems. By translating complex security concepts into accessible media through the LiveOverflow brand, he plays a critical role in democratizing knowledge about vulnerabilities and system design. His work bridges the gap between academic computer science and the hacker community, helping to train the next generation of security professionals.

## Notable For
*   **Educational Influence:** Operating a YouTube channel with over 65 million views, making complex hacking topics accessible.
*   **Entrepreneurship:** Founding and owning Security Flag GmbH.
*   **Verification:** Holding verified status on major social platforms like Twitter.
*   **Cross-Platform Presence:** Maintaining active identities on YouTube, Twitter, Bluesky, Instagram, Reddit, GitHub, and Keybase.
*   **Computer Science Advocacy:** Identifying as a computer scientist and hacker, focusing on the theoretical underpinnings of security rather than just tool usage.

## Body

### Professional Identity
Fabian Faessler is a German security researcher and computer scientist. His professional classification falls under the broader category of scientists and technology specialists who study or practice computer science. This field focuses on the theoretical foundations of information and computation and the design of computational systems. Faessler operates explicitly as a "hacker" and "YouTuber," applying these theoretical skills to practical security analysis and digital content creation.

### The LiveOverflow Brand
Faessler operates primarily under the alias **LiveOverflow**. This brand encompasses his website (`liveoverflow.com`) and his social media presence.
*   **Website:** The official blog is located at `https://liveoverflow.com/topic/blog/`.
*   **Social Media Reach:** His primary distribution channel is YouTube.
    *   **Twitter:** His account `@liveoverflow` is verified, with 107,333 followers recorded in August 2022.
    *   **YouTube:** His channel (`UClcE-kVhqyiHCcjYwcpfj9w`) started in March 2015.
    *   **Bluesky:** He maintains a handle at `liveoverflow.bsky.social`.
    *   **Facebook:** His page "LiveOverflow" serves as another distribution point for his content.

### Business and Contact
Faessler operates through **Security Flag GmbH**. Business inquiries are directed to email addresses associated with this domain (`securityflag.de`).
*   **Public Key:** He provides a PGP Public Key fingerprint for secure communication: `0766 42F9 6465 3FDE 55C1 2DFD 6680 43C6 AE81 288B`.
*   **Email:** Specific contact points include `fabian@securityflag.de` and `youtube+web@securityflag.de`.

### Audience Metrics
Faessler has built a substantial global audience through his content.
*   **YouTube Statistics:**
    *   **Subscribers:** 930,000 (as of Nov 27, 2025).
    *   **Views:** 65,619,587 total views (as of Nov 27, 2025).
    *   **Video Count:** 369 videos (as of July 2022).
*   **Other Platforms:**
    *   **Instagram:** 8,065 followers (Handle: `liveoverflow`).
    *   **Keybase:** 107 followers.
    *   **Facebook:** 5,303 followers.

## References

1. [Source](https://liveoverflow.com/imprint/)
2. [Source](https://www.liveoverflow.com/)
3. [Source](https://keybase.io/liveoverflow)
4. YouTube API