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🧭 Explore 🌍 Top creators in Japan Mastodon rankings
Marc A. Kastner

Marc A. Kastner✓ Add us as a preferred source on Google

Mastodon @mkasu@social.lol 📍 Japan
⚔ Compare ☆ Follow Own this channel?
🔄 Data last refreshed 9 hours ago
🤝

Make a deal with Marc A. Kastner

🔒 Paid proposals held safely in escrow — released only when the work's approved.

📣Sponsored postOne disclosed post (toot) with your link and message. $12→ 🧵Sponsored threadA multi-post explainer or story — the fediverse rewards depth over one-liners. $30→ 📦Product seeding / honest reviewSend me your product — I post a disclosed, honest take. Authenticity is the only ad this audience tolerates. $16→ 📌Pinned sponsored postA disclosed post pinned to the top of my profile for the month. $36/mo→ 🔗Profile link (bio field)Your link in one of my profile metadata fields for the month — native and low-key. $18/mo→ 🔁Boost packageI boost (repost) your account's toots through the month — distribution with zero content lift. $24/mo→ 🏛️Instance / community sponsorshipSponsor the server I run — a sponsor line in the About/rules and a welcome shout. A goodwill buy that keeps our community running. $30/mo→ 🤝Mutual boost collabWe boost each other across instances — a value swap between communities. Swap or paid→ 🎬UGC HireBranded content for your own channels & ads from $50→ 🎙️Podcast guest spotInvite Marc A. Kastner onto your podcast (~45 min, remote) $25→ 📞1:1 ConsultPaid video call — advice, coaching or Q&A $75/hr→

Every booking is a normal escrow-protected deal.

Followers
73
Account age
0 yrs
🎁 Free analysisfor Marc A. Kastner
🕵️Fake Followers CheckReal-audience % & bot risk→ 📊Engagement rateBenchmarked vs. peers→ 💰What they chargeFair sponsored-post price→

Known for

New pajama my wife got me when she was shopping with a friend at uniqlo3 views New pajama my wife got me when she was shopping with a friend at uniqlo 🍣2 views 🍣 Number of plates my wife ate vs. mine2 views Number of plates my wife ate vs. mine

📊 Post engagement

Recent posts · likes + reposts
Apr 25latest
3
Avg engagement / post
2–3
Typical post (engagement)
4.1%
Engagement vs followers
79/100
Very consistent reach
Feb 2026
On Mastodon since
Half of recent posts land between 2 and 3 likes + reposts (median 3) — a dependable floor a sponsored post can count on.

🔥 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
0.9×
Follows 81 back. A more reciprocal / networked account.

Recent posts

View on Mastodon ↗
🔥 Top post We had an open campus yesterday. According to my lab students, there were a concerning amount of high school students who came to us with "I'm already a programmer and thus want to do computer science degree so I can do this professionally", which when asked "Oh nice which progr… ★ 5
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-… ★ 1 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 ★ 3 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… ★ 3 @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! 🍣 ★ 2 Number of plates my wife ate vs. mine ★ 2 💊 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.
📍Based in Japan.

🕵️ Fake follower check

Estimated
67/100
Good Credibility score
87%
Real Real audience
Low Fake-follower risk
High Data confidence
  • Est. 87% real, active audience · Low fake-follower risk.
  • Engagement (~4.1% of followers engage each post) is around typical for Mastodon.
  • 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

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 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

🔀 Audience overlap

Estimated

Estimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.

Ferreni Ferreni 18% Chill Chill 18% [Subnet] ~# [Subnet] ~# 15% Rossp Rossp 13% MrBlipvert (David Haraldson) MrBlipvert (David Haraldson) 10% JvB 🇨🇦🐱 JvB 🇨🇦🐱 10%

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JvB 🇨🇦🐱
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[Subnet] ~#
[Subnet] ~# ✓
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73 Followers
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Rossp
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73 Followers
Mastodon ＋
Chill
Chill ✓
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73 Followers

Frequently asked questions

How much does Marc A. Kastner charge for a sponsorship?
Marc A. Kastner hasn't published fixed prices yet. Send a proposal through SocialDB and agree terms directly — your payment is held in escrow until the work is approved.
How do I contact Marc A. Kastner for a brand deal or collaboration?
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How many followers does Marc A. Kastner have?
Marc A. Kastner has 73 followers on Mastodon.

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