🤝
Make a deal with Marc A. Kastner
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
72
Account age
0 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 Marc A. Kastner
Known for
📊 Post engagement
3
Avg engagement / post
4.2%
Engagement vs followers
Feb 2026
On Mastodon since
🔥 Top post: We had an open campus yesterday. According to my lab students, t · 5 likes + reposts
📊 Activity & format
Posting cadence
1.7 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 7 text · 5 image · 0 video.
Follower / following
1.1×
Follows 68 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
Having a blast with my Switch 2 playing Switch 1 games https://marc-kastner.com/posts/having-a-blast-with-my-switch-2-playing-switch-1-games
I started drawing as a "new" hobby some years ago. I'm still kind of bad but I really enjoy it. I summarized my journey so far. My current "project" is creating custom chat stickers for my family chats.
https://marc-kastner.com/posts/dabbl…
It was the first WWDC since I stopped using Apple ecosystem everywhere, so I used opportunity to think about whether my switch was correct decision for me or not (TLDR: Yes no regrets so far)
https://marc-kastner.com/posts/wwdc-and-half-a-…
In my Charizard T-Shirt, having a tiny charizard sitting on my shoulder 🦎
New pajama my wife got me when she was shopping with a friend at uniqlo
Richard @macpsych inspired me to do a blog post with mostly just pictures.
Rather than random pics I decided a topic to select pictures from: All my food pictures in first half of 2026 :-).
https://marc-kastner.com/posts/2026-the-year-in-f…
@jbaty btw, not trying to stir things up... but... TheBrain 15 just released a full fledged native Linux version 😎
Another week of my wife (left) vs me (right). Maybe I eat too much. Maybe she eats too little!
🍣
Number of plates my wife ate vs. mine
💊 Another two weeks of pain killers and physical therapy prescribed. It feels like pain is even spreading into new body regions. It used to be mainly neck and jaw area but now it spreads down into the leg. Basically whole left body side...…
In my Charizard T-Shirt, having a tiny charizard sitting on my shoulder 🦎
New pajama my wife got me when she was shopping with a friend at uniqlo
Richard @macpsych inspired me to do a blog post with mostly just pictures.
Rather than random pics I decided a topic to select pictures from: All my food pictures in first half of 2026 :-).
https://marc-kastner.com/posts/2026-the-year-in-f…
@jbaty btw, not trying to stir things up... but... TheBrain 15 just released a full fledged native Linux version 😎
Another week of my wife (left) vs me (right). Maybe I eat too much. Maybe she eats too little!
🍣
Number of plates my wife ate vs. mine
💊 Another two weeks of pain killers and physical therapy prescribed. It feels like pain is even spreading into new body regions. It used to be mainly neck and jaw area but now it spreads down into the leg. Basically whole left body side...…
🐘 Community & instance
Home server
social.lol
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
✅ 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
Feb 2026
An established account with real history on the platform.
💡 Facts
🗓️Joined Mastodon in 2026.
👁️Averages 3 views per post.
📤Posts about 1.7× per week.
🕵️ Fake follower check
Estimated81/100
Excellent
Credibility score
95%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 95% real, active audience · Low fake-follower risk.
- Strong engagement (~4.2% of followers engage each post) — an active, real audience.
- Verified account.
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
36, German permanently living in Japan.
Professionally I'm university lecturer in Computer Science, in my free time I am into photography and video games. I'm also into languages and often speak weird stuff, like Esperanto. Recently I started drawing and digital painting as as another hobby to dabble into.
📸 Gallery
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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