Jann Horn✓ Add us as a preferred source on Google
🔄 Data last refreshed 1 month ago
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Make a deal with Jann Horn
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
2.6K
Account age
3 yrs
💰 Suggested sponsorship rate
$40 – $65 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🎁 Free analysisfor Jann Horn
📊 Post engagement
Recent posts · likes + reposts
Jun 5latest
12
Avg engagement / post
4–12
Typical post (engagement)
0.5%
Engagement vs followers
63/100
Consistent reach
Nov 2022
On Mastodon since
Half of recent posts land between 4 and 12 likes + reposts (median 12) — a dependable floor a sponsored post can count on.
🔥 Top post: yikes - a USB speaker with pre-authentication bluetooth attack s · 35 likes + reposts
📊 Activity & format
Posting cadence
1.6 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 12 text · 0 image · 0 video.
Follower / following
18×
Follows 142 back. A strong ratio — an audience that follows them, not a follow-for-follow network.
Recent posts
View on Mastodon ↗
The combination of Linux stable backports and not having explicitly documented and enforced API contracts is so annoying.
Write a bugfix that uses an existing helper function that can return error type A. Your bugfix gets backported to an …
Fun Linux fact: If you race dup(5) and close(5), the kernel handles that fine, but it can lead to the unusual result that dup(5) returns 5.
Fun Linux fact:
On a Linux system where /tmp/ is tmpfs, if you create the following directories:/tmp/pathwalktest/tmp/pathwalktest/a/tmp/pathwalktest/a/b/tmp/pathwalktest/cand callrename("/tmp/pathwalktest/a/b", "/tmp/pathwalktest/b")
then…
there is a recipe website with a "baking mode" toggle that uses the Screen Wake Lock API so the screen doesn't turn off while you have dough all over your hands and that just feels like such a nice little detail
there is a footer with a region selector and such but it only shows up for a tiny moment before it gets replaced with other stuff again (though after a few iterations of this it does stop)
try scrolling to the bottom of the frigging amazon.com homepage, on mobile, signed-out
web designers: "how about we put the important stuff that goes on every page at the top, and the boring stuff that goes on every page at the bottom? and how about we replace pagination with endless scroll? and since those are both such gre…
I filed this bug 90 days ago, about how Pixel has an out-of-tree kernel driver that wrongly uses set_page_dirty() instead of set_page_dirty_lock(), leading to UAF:
https://project-zero.issues.chromium.org/494546491
That bug (reachable from…
ah, I see http://doublewise.net/c++/bounded/reference/ seems to do this
randomly wondering: are there C++ codebases out there that have bounded number types with __builtin_assume()? like:#include <utility>
[[noreturn]] static inline void ud2() {
asm volatile("ud2");
std::unreachable();
}
template<typen…
This was a fun Linux kernel bug (though it only existed on >=6.10 and requires access to network namespaces): https://project-zero.issues.chromium.org/496923375
One of those rare bugs where, if you pass a kernel address in the right place,…
🐘 Community & instance
Home server
infosec.exchange
A cybersecurity & infosec server — its members and audience skew toward that niche, so expect a community-aligned, engaged following.
✅ Link-verified
Verified link
Proved ownership of a website linked on their profile — Mastodon's green-check verification, a real identity signal rather than a paid badge.
On Mastodon since
Nov 2022
Joined in the Twitter-exodus wave of late 2022 — part of the migration that made Mastodon a real destination.
💡 Facts
🗓️Joined Mastodon in 2022 — 3 years ago.
👁️Averages 12 views per post.
📤Posts about 1.6× per week.
🕵️ Fake follower check
Estimated58/100
Fair
Credibility score
81%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 81% real, active audience · Low fake-follower risk.
- Low engagement (~0.5% of followers engage each post) — a sign of an inflated or inactive audience.
- Organic base — far more followers than accounts it follows.
- Verified account.
- Established account (3+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
human borrow checker (but logic bugs are best bugs).
works at Google Project Zero.
The density of logic bugs (compared to memory corruption bugs) goes down as the privilege differential between attacker context and target context goes up.
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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Frequently asked questions
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How many followers does Jann Horn have?
Jann Horn has 2,594 followers on Mastodon.
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