🤝
Make a deal with John D. Cook
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
1.2K
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 analysis for John D. Cook
Known for
9 views
Volume to Area ratio for Regular Solids
https://www.johndcook.com/blog/2026/07/20/volume-area-regular-solids/
4 views
Solving a chess puzzle by asking Grok 4.5 to generate Lean 4 and Prolog code.
https://www.johndcook.com/blog/2026/07/20/grok-chess/
3 views
There are infinitely many solutions to sin(x degrees) = sin(x radians) and these solutions are dense mod 2 pi.
https://www.johndcook.com/blog/2026/07/22/degrees-radians/
1 views
Visualizing the number of medical codes (ICD-10 and HCPCS) that start with each letter.
https://www.johndcook.com/blog/2026/07/17/visualizing-medical-code-hierarchy/
📊 Post engagement
4
Avg engagement / post
0.3%
Engagement vs followers
Nov 2022
On Mastodon since
🔥 Top post: Volume to Area ratio for Regular Solids https://www.johndcook.co · 9 likes + reposts
📊 Activity & format
Posting cadence
7.9 / week
Toots daily — consistently active for a campaign window.
Content mix
Mostly images
Recent: 6 text · 6 image · 0 video.
Follower / following
40×
Follows 29 back. A strong ratio — an audience that follows them, not a follow-for-follow network.
Recent posts
View on Mastodon ↗
🔥 Top post
Volume to Area ratio for Regular Solids
https://www.johndcook.com/blog/2026/07/20/volume-area-regular-solids/
There are infinitely many solutions to sin(x degrees) = sin(x radians) and these solutions are dense mod 2 pi.
https://www.johndcook.com/blog/2026/07/22/degrees-radians/
New post: Forensic accounting in Python.
https://www.johndcook.com/blog/2026/07/21/forensic-accounting-in-python/
Explaining the Jacobian conjecture counterexample:
Locally invertible everywhere does not imply invertible.
https://www.johndcook.com/blog/2026/07/21/jacobian-conjecture/
Solving a chess puzzle by asking Grok 4.5 to generate Lean 4 and Prolog code.
https://www.johndcook.com/blog/2026/07/20/grok-chess/
Fitting a regular expression to a list of words
https://www.johndcook.com/blog/2026/07/19/fitting-a-regex/
New post: Sum of low squares
https://www.johndcook.com/blog/2026/07/19/sum-of-low-squares/
Visualizing the number of medical codes (ICD-10 and HCPCS) that start with each letter.
https://www.johndcook.com/blog/2026/07/17/visualizing-medical-code-hierarchy/
How ICD-10 chapters and code letters relate
https://www.johndcook.com/blog/2026/07/14/icd-10-chapters-letters/
New post: Posterior varaince
https://www.johndcook.com/blog/2026/07/12/posterior-variance/
New post: Posterior mean
https://www.johndcook.com/blog/2026/07/12/posterior-mean/
Progress on Gilbreath’s conjecture
https://www.johndcook.com/blog/2026/07/11/progress-on-gilbreaths-conjecture/
🐘 Community & instance
Home server
mathstodon.xyz
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
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 4 views per post.
📤Posts about 7.9× per week.
🕵️ Fake follower check
Estimated66/100
Good
Credibility score
89%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 89% real, active audience · Low fake-follower risk.
- Engagement (~0.3% of followers engage each post) is around typical for Mastodon.
- Established account (3+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
Consultant in applied mathematics and data privacy
https://www.johndcook.com
📸 Gallery
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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