Simon Josefsson✓ Add us as a preferred source on Google
🔄 Data last refreshed 26 days ago
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Make a deal with Simon Josefsson
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
264
Account age
8 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 Simon Josefsson
📊 Post engagement
Recent posts · likes + reposts
Feb 1latest
9
Avg engagement / post
2–12
Typical post (engagement)
3.4%
Engagement vs followers
37/100
Variable reach
Sep 2018
On Mastodon since
Half of recent posts land between 2 and 12 likes + reposts (median 4) — reach is spiky, driven by the occasional post that pops.
🔥 Top post: Please welcome Guile Hoot in Debian #guile https://tracker.debia · 42 likes + reposts
📊 Activity & format
Posting cadence
0.62 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 11 text · 1 image · 0 video.
Follower / following
0.6×
Follows 420 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
Guile-GnuTLS v5.0.2 #guile https://lists.gnupg.org/pipermail/gnutls-help/2026-June/004930.html
”Exploiting ML-DSA bugs” - graphing risks with ML-DSA vs Ed25519+ML-DSA. https://cr.yp.to/papers/mldsa-20260601.pdf
Contrary opinion: go.sum is a generated non-source file and should not be stored in any git repository.
“Monitors 36 window.__oai_so_* properties tracking keystroke timing, mouse velocity, scroll patterns, idle time, and paste events. A behavioral biometric layer running underneath the fingerprint.” - how about saying that more clearly: Clou…
Please welcome age-plugin-tpm to Debian! @Foxboron https://tracker.debian.org/pkg/age-plugin-tpm
“verification theatre” - https://eprint.iacr.org/2026/192
”Cryspen’s Approach to TLS: A Critical Analysis” https://symbolic.software/blog/2026-03-07-cryspen-tls/ - I feel less confident about OpenSSH’s ML-KEM libcrux approach now
Great talk from @bunnie about the hardware supply-chain as a threat model in https://media.ccc.de/v/38c3-iris-non-destructive-inspection-of-silicon which is similar to my thinking about security dongle safety in https://blog.josefsson.org/…
”Reports of Telnet’s Death Have Been Greatly Exaggerated” https://www.terracenetworks.com/blog/2026-02-11-telnet-routing
Finally video is available too: https://video.fosdem.org/2026/ub4136/ZELSB8-guix-containers.av1.webm It seems video subtitle texts were automagically created by the FOSDEM video team, and it is wonderful to see that it s/Guix/geeks/ all o…
Slides now up: https://josefsson.org/talks/fosdem-guix-container-images.pdf
The project source code: https://gitlab.com/debdistutils/guix/container
Docker Hub: https://hub.docker.com/r/jas4711/guix
Enjoy and happy hacking ☀️
”Exploiting ML-DSA bugs” - graphing risks with ML-DSA vs Ed25519+ML-DSA. https://cr.yp.to/papers/mldsa-20260601.pdf
Contrary opinion: go.sum is a generated non-source file and should not be stored in any git repository.
“Monitors 36 window.__oai_so_* properties tracking keystroke timing, mouse velocity, scroll patterns, idle time, and paste events. A behavioral biometric layer running underneath the fingerprint.” - how about saying that more clearly: Clou…
Please welcome age-plugin-tpm to Debian! @Foxboron https://tracker.debian.org/pkg/age-plugin-tpm
“verification theatre” - https://eprint.iacr.org/2026/192
”Cryspen’s Approach to TLS: A Critical Analysis” https://symbolic.software/blog/2026-03-07-cryspen-tls/ - I feel less confident about OpenSSH’s ML-KEM libcrux approach now
Great talk from @bunnie about the hardware supply-chain as a threat model in https://media.ccc.de/v/38c3-iris-non-destructive-inspection-of-silicon which is similar to my thinking about security dongle safety in https://blog.josefsson.org/…
”Reports of Telnet’s Death Have Been Greatly Exaggerated” https://www.terracenetworks.com/blog/2026-02-11-telnet-routing
Finally video is available too: https://video.fosdem.org/2026/ub4136/ZELSB8-guix-containers.av1.webm It seems video subtitle texts were automagically created by the FOSDEM video team, and it is wonderful to see that it s/Guix/geeks/ all o…
Slides now up: https://josefsson.org/talks/fosdem-guix-container-images.pdf
The project source code: https://gitlab.com/debdistutils/guix/container
Docker Hub: https://hub.docker.com/r/jas4711/guix
Enjoy and happy hacking ☀️
🐘 Community & instance
Home server
fosstodon.org
A open-source software 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
Sep 2018
An OG fediverse account from Mastodon's early years — a long, established presence.
💡 Facts
🗓️Joined Mastodon in 2018 — 8 years ago.
👁️Averages 9 views per post.
📤Posts about 0.6× per week.
🕵️ Fake follower check
Estimated75/100
Good
Credibility score
92%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 92% real, active audience · Low fake-follower risk.
- Engagement (~3.4% of followers engage each post) is around typical for Mastodon.
- Verified account.
- Established account (8+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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11%
Philipp Alexander Vollmer
11%
Mörderische Schwestern e.V.
10%
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Frequently asked questions
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Simon Josefsson has 264 followers on Mastodon.
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