# 福島 啓和 / Railway & advertising Photographer (@fukuchin_san) on x

- id: koinon:creator:x_fukuchin_san
- url: https://koinonlink.com/kol/x/fukuchin_san
- schema_version: 1.4

## Identity
- platform: x
- handle: fukuchin_san
- platform_url: https://twitter.com/fukuchin_san
- website: https://youtu.be/DqIy0G399cc?si=IlDpZbujJBF-fmvs&t=40
- entity_type: creator
- person_id: Cross-platform identity not resolved for this creator.

## Reach
- followers: 1383
- following: 297
- posts_total: 3561
- posts_observed: 1
- posts_per_day: 0.79
- account_age_days: 4510
- verified: false
- size_tier: nano

## Engagement
- status: peak_post_only
- peak_post_engagement_rate: 0.04989
- best_post_interactions: 69
- measurement_source: x_post_interactions
- measurement_formula: interactions on one post — likes, or likes + reposts + replies depending on the discovery path (the two are not distinguishable in the stored data)
- comparable_pool: peak_interactions
- status_note: We have only the single best observed post, so no mean exists. peak_post_engagement_rate is an UPPER BOUND, systematically higher than an average — never compare it against an average rate.
- unit_note: engagement_rate and peak_post_engagement_rate are ratios (0-1); avg_interactions_per_post and best_post_interactions are absolute counts. Read status before reading any number: a null rate has several different causes and status says which one applies here.

## Content
- category: lifestyle
- subcategory: travel
- category_confidence: 0.85
- category_source: derived_from_recent_content
- topics: Regional railway photography in Kyushu, Heritage and restoration of vintage Japanese trains, Visual storytelling for local tourism and rail promotion, Offline advertising and physical promotional materials, JR Kyushu and West Japan Railway Company (WR) train operatio
- bio: JR九州のCM・オフィシャルのスチール・ムービーを担当。
ななつ星in九州をはじめ、九州・西九州新幹線やD&S列車プロモーションに携わる。 2003年〜広告写真スタジオ勤務、 2013年独立。Instagram→https://t.co/Ik5JT2Jmpa

## Audience (inferred)
- status: present
- description: Railway enthusiasts and regional tourism promoters in Kyushu, Japan, particularly those involved in local transportation branding and heritage preservation
- roles: general_ai
- seniority: practitioner
- pain_points: Struggling to find authentic visual content that captures the unique charm of regional Japanese railways, Frustrated by the lack of cohesive visual storytelling for local rail tourism campaigns, Overwhelmed by the challenge of balancing nostalgic aesthetics with modern promotional needs
- posts_analysed: 8
- confidence: 0.4

## Commercial (inferred)
- audience_buyer_fit: 0.2
- promotion_intent: 0.1
- open_to_collaboration: false
- contact: Koinon does not publish creator contact details.

## Quality signals
- authenticity_score: 60
- authenticity_basis: engagement_observed
- credibility_score: 60
- flagged_for_review: false
- koinon_bd_grade: C — measures Koinon partner-outreach fit, not creator quality
- interpretation: Signals for triage, not verdicts. A flag means the profile is worth a manual check.

## Evidence
- [x_fukuchin_san#447e6e88] オフライン広告の回帰か！ いいぞ！紙パンフ、ポスター作ろう！ (https://twitter.com/fukuchin_san/status/2032334002674418083)
- [x_fukuchin_san#dbd4ce8a] 10年前はこんな感じ https://t.co/g8FTDPADM2
- [x_fukuchin_san#dc06d3db] 今日の大分駅はポケモンGOのなんかあってるん？ 奇妙な歩きスマホやたむろが大量発生しとる。 やるのは結構だけど通行を邪魔してまですることか？
- [x_fukuchin_san#cd21bb6c] 静かな時間 https://t.co/bnfeaUn6JB
- [x_fukuchin_san#bdfde09b] 西鉄バスの走る風景 https://t.co/mZqWiQ6Dh3
- [x_fukuchin_san#e3b86a7e] 九州の黄色い鉄道車両たち https://t.co/DulClVzQ16
- [x_fukuchin_san#0b1fa625] 西鉄600形（608/659)がツートン復刻とのことで、313形のツートン復刻色を懐かしみましょう https://t.co/HySWnaV0wb
- [x_fukuchin_san#d6ec6922] 意外と種類豊富なJR九州の直流電車 https://t.co/5NDL6q7NOG

## Provenance
Every inferred field below carries how it was produced. Facts stay facts; inferences stay inferences.

- audience.description: source_type=ai_inferred, confidence=0.4, freshness_days=20, method=llm_persona_from_recent_content
- audience.roles: source_type=ai_inferred, confidence=0.4, freshness_days=20, method=llm_persona_from_recent_content
- audience.seniority: source_type=ai_inferred, confidence=0.4, freshness_days=20, method=llm_persona_from_recent_content
- commercial.audience_buyer_fit: source_type=ai_inferred, confidence=0.6, freshness_days=80, method=llm_scorer — Relative signal within Koinon indexing, not a market-wide score.
- commercial.promotion_intent: source_type=ai_inferred, confidence=0.6, freshness_days=80, method=llm_scorer
- quality.anomaly_flags: source_type=heuristic, confidence=0.5, freshness_days=111, method=profile_snapshot_and_engagement_ratio_heuristic — Means "worth a manual check", NOT confirmed fraud. Flags can be wrong and are not a verdict about the person.
- quality.authenticity_score: source_type=heuristic, confidence=0.5, freshness_days=80, method=Profile-shape heuristic from a single snapshot (follower count, following ratio, account age, posting volume, verification), reduced for engagement red flags where post engagement was collected. Where only a follower count is available the score saturates at 58. — The input set differs by platform; do not compare this score across platforms.
- quality.koinon_bd_grade: source_type=ai_inferred, confidence=0.5, freshness_days=111, method=llm_partner_fit_classifier + fit_score >= 0.6 AND authenticity >= 60 => A; fit_score >= 0.4 AND authenticity >= 45 => B; else C. authenticity < 30 or a promotional-pattern flag => quarantine. — Koinon partner-outreach fit, not creator quality.
- reach.followers: source_type=observed, confidence=0.95, freshness_days=111, method=platform_profile

## Freshness
- profile_checked_days_ago: 111
- content_analysed_days_ago: 80
- audience_updated_days_ago: 20

## AI retrieval
- indexing_requests: 7
- user_triggered_requests: 0
- note: Being indexed in bulk is not the same as being retrieved to answer a question.

## This profile
- Claim or correct: https://koinonlink.com/claim?k=x_fukuchin_san
- Request removal: https://koinonlink.com/claim?k=x_fukuchin_san
- Terms: https://koinonlink.com/for-ai