岩波書店

岩波書店

@Iwanamishoten

1913年創業の総合出版社です。岩波文庫、岩波新書、人文書、自然科学書、児童書、広辞苑を含む辞典など。問い、考えることを世の人々と共にするため、学術研究、思想、文学、芸術等の人間の創造活動の成果を広く伝えていきます。ご質問はメールにてお願いいたします。☞ twitter_adあっとまーくhttps://t.co/yuT8uV3KlW

東京都千代田区 https://www.iwanami.co.jp/ Joined 2010-10-15 Date of Analysis: Dec 16, 2025

122,721

Followers

1,179

Following

55,906

Tweets

144.3

Avg Engagement

3,619

Listed

No

Verified

Account Overview

What This Report Covers

This comprehensive analysis examines @Iwanamishoten's Twitter/X presence across multiple dimensions. We analyze tweet content, engagement patterns, audience demographics, posting habits, and network connections to provide actionable insights about this account's social media strategy and influence.

Account Classification

  • Account Size: Macro Influencer (100K+)
  • Account Age:2010-10-15
  • Verification:No
  • Location:東京都千代田区

Data Summary

  • Tweets Analyzed:3,240
  • Avg Likes per Tweet:76.9
  • Avg Retweets per Tweet:67.3
  • Followers Analyzed:10,000

Engagement Analysis

Based on 3,240 tweets

投稿は平均して7,164 likesと2,535 RTで、高めのエンゲージメントを示しています。特に社会問題や思想に関する投稿が好まれています。

76.9

Avg Likes/Tweet

67.3

Avg Retweets/Tweet

249,256

Total Likes

218,210

Total Retweets

Engagement Quality Analysis

Median-based metrics that resist fake virality and outliers.

0

Median Likes

19

Median Retweets

115

75th Percentile

39,952

Top Tweet

1.18

Engagement per 1K Followers

Normalized influence metric

Viral Spikes

Engagement Pattern

Few posts get most engagement

Posting Behavior

Content style and format preferences

Curator

Amplifies others content frequently

30.8%

Original

2.9%

Replies

57.8%

Retweets

8.5%

Quotes

0.0%

Threads

0.0%

With Media

95.5%

With Links

22.5%

With #Tags

59.2%

With @Mentions

7.0%

With Emojis

163

Avg Length

Audience Reaction Profile

Broadcast

Focuses on original content over replies

0.09

Reply/Original Ratio

0.15

Quote/RT Ratio

Posting Rhythm

Consistent

Regular posting cadence

78.7%

Weekday Posts

21.3%

Weekend Posts

Top Hashtags

#岩波世界 (118) #広辞苑で都道府県めぐり (42) #岩波書店 (19) #岩波現代文庫 (17) #本のたねをまく (17) #ボブ (17) #北方謙三 (16) #猫の日 (15) #100分de名著 (12) #広辞苑ことば散歩 (10)

Most Mentioned

@iwanami_shinsho (169) @web_sekai (150) @iwabun1927 (128) @iwanami_genbun (87) @iwnmpromotion (86) @iwanamijunior (82) @iwanamijidosho (72) @kojien7 (62) @iwanami_ebooks (61) @iwanaminatura (39)

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Content Strategy Analysis

Based on 3,240 tweets

Content Type Distribution

Content Breakdown

Original Tweets 997 (31%)
Replies 93 (3%)
Retweets 1,873 (58%)
Quote Tweets 277 (9%)

What This Reveals About Their Strategy

This is a content-creator focused account that primarily shares original thoughts, ideas, and media. With original content dominating their feed, they position themselves as a source of new information rather than a curator. This strategy works well for establishing thought leadership.

The 1,873 retweets (58% of activity) show they also amplify content from others, which helps build relationships with other accounts and provides value to followers by surfacing relevant content.

Posting Patterns & Optimal Timing

Based on 3,240 tweets

Engagement by Hour (UTC)

Posting Frequency Over Time

Timing Insights

Understanding when an account posts and when their audience is most responsive provides valuable competitive intelligence. The charts above show when this account's content receives the most engagement, which often correlates with when their specific audience is most active on the platform.

Peak posting times vary significantly based on an account's audience demographics, timezone distribution, and content type. Accounts with global audiences often see engagement spread across multiple time windows, while those with regional focus may have more concentrated peaks.

Audience Demographics

Based on 10,000 followers

主に学術や思想に興味を持つ研究者や教育機関の関係者、また知識欲のある一般読者層がターゲットです。社会問題に興味を持つ人々も注目しています。

Good

Audience Quality

19.7%

Suspicion Index

24.1%

Low-Quality %

34

Median Reach

Audience Quality Signals

Lower percentages indicate healthier, more authentic followers.

31.9%

Empty Bio

22.7%

<10 Tweets

7.4%

Mass Following (>2K)

0.0%

New (<90 days)

43.8%

Low Ratio (<0.1)

0.0%

New (<180 days)

85.5%

No URL

16.3%

<3 Tweets

Free Mode Analysis: These quality metrics use heuristic signals (empty bios, low tweets, suspicious ratios). For ML-powered bot detection with 95%+ accuracy, use our dedicated tool.

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Follower Reach & Influence

This account's followers have their own audiences, creating potential for secondary amplification.

3,750,441

Total Potential Reach

34

Median Follower Reach

167

75th Percentile Reach

5.2%

>1K followers

0.4%

>10K followers

0.1%

>50K followers

0.0%

>100K followers

Creator vs Consumer Split

Classification based on tweet activity: Creators (>100 tweets), Consumers (10-100 tweets), Dormant (<10 tweets).

59.8%

Creators

5,983 accounts

17.5%

Consumers

1,751 accounts

22.7%

Dormant

2,266 accounts

54

Verified Followers

0.54% of total

0.9%

Professional Bios

founder, dev, analyst, etc.

0.13

Median Follow Ratio

follower/following

Follower Influence Distribution

How many followers do their followers have?

Follower Account Age

How long have followers been on Twitter?

Geographic Distribution

Top locations where followers are based (from those who share location data):

日本 (273) Japan (136) 東京 (80) 日本 東京 (78) Tokyo (68) 東京都 (38) Tokyo-to, Japan (23) Tokyo, Japan (19) 大阪 (18) japan (13)

54

Verified Followers

0.54% of total

2,285

Protected Accounts

22.85% of total

5 years

Avg Account Age

of their followers

Notable Followers (By Influence)

Top accounts following this user, sorted by their follower count:

Username Followers Profession Interests
@aveirjapan 202,076 Artist Art, Truth, Picasso
@karahashi_yumi 128,986 TV Personality sumo, beauty, singing
@ciotan 114,119 Writer writing, travel, literature
@tokyonewsroom 73,719 News Editor news, Tokyo, journalism
@JpCointelegraph 69,381 Cryptocurrency Media Cryptocurrency, Media, Japan
@yoshi_akihito 61,668 Mangaka manga, artist, illustrator
@iLLNESSDEAD 56,722 Mental Health Mental health, Advocacy, Awareness
@ytsuji2001 55,419 Politician politics, sports, journalism
@ALISON_airlines 54,693 Airline Travel, Aviation, Work opportunities
@shinsekaihero 53,889 - -

Top Keywords in Follower Bios

twitter (107) dm (67) rt (61) b (47) note (37) tokyo (36) rom (36) web (35) japan (35) youtube (34)

Top Hashtags in Follower Bios

#読書好きな人と繋か (13) #読書垢 (10) #読書 (9) #ハ (8) #ホ (7) #ト (5) #読了 (5) #ヒ (5) #シ (5) #読書好きと繋か (4)

6,809

Followers With Bio

3,191

Followers Without Bio

68.09%

% With Bio

31.91%

% Without Bio

Why Audience Demographics Matter

Understanding who follows an account reveals the type of influence they hold. Accounts followed primarily by users with few followers indicate broad, mainstream appeal. Those with many high-follower followers have greater potential for content amplification through secondary sharing.

Account age distribution also tells a story: a follower base with many new accounts might indicate recent viral growth, while established followers suggest long-term, stable influence. Geographic data helps understand the cultural context and timezone spread of the audience.

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Viral Tweets

Top 5 by likes+RTs from 3,240 analyzed

111,778

Combined Engagement

58,408

Total Likes

53,370

Total Retweets

22,356

Avg per Tweet

Key Metrics for Viral Tweets

0%

With Media

20%

With Hashtags

40%

With @Mentions

100%

With Links

Topical Analysis:

思想 社会問題 学術 性の多様性 歴史 教育
岩波書店
@Iwanamishoten

岸田首相は同性婚に対し、「社会が変わってしまう」と否定的な考えを示しました。 お約束ですが、今回も2013年にニュージーランドのウィリアムソン議員が行ったスピーチ動画を貼っておきます。☞ https://t.co/GqfjfkIiJ0 https://t.co/fQiqVeivfd

2023-02-01
Retweets: 12,709 Likes: 27,243 Engagement: 39,952
岩波書店
@Iwanamishoten

かつて日本は「性の多様性」に寛容でした。異性愛規範が強化されたのは西洋化以降であり、それ以前のアジアでは豊かな性別越境文化が築かれていました。 ヤマトタケルの時代から現代まで、民俗学や地理学の手法も駆使し縦横無尽に「性」の多様性を検証します。 三橋順子『歴史の中の多様な「性」』 https://t.co/mdFZ3iErQy https://t.co/9Ncc5g4J2Z

2023-02-03
Retweets: 5,709 Likes: 18,095 Engagement: 23,804
岩波書店
@Iwanamishoten

RT @yoshimotoshoten: 古本屋なら誰でも知っているけど、グラシン紙は本当に偉い。身を挺して本を守ってくれる。こんな真っ黒焦げの岩波文庫もグラシン紙を剥くとホントきれいです。 https://t.co/r8XFjMu8Tr

2023-01-23
Retweets: 16,893 Likes: 0 Engagement: 16,893
岩波書店
@Iwanamishoten

タイパが重視される時代だからこそ。 https://t.co/tVltr5zp93

2023-01-30
Retweets: 2,832 Likes: 13,070 Engagement: 15,902
岩波書店
@Iwanamishoten

RT @eiga_tsukimichi: 第46回 #日本アカデミー賞 🎬優秀賞9部門&amp;新人俳優賞受賞🎖️  ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ☾*・。 受賞一覧 。・*☽ ✧作品賞:#月の満ち欠け ✧主演男優賞:#大泉洋 ✧助演女優賞:#有村架純 ✧助演男優賞:#目黒蓮 (#SnowMan) ✧新人俳優賞:#目黒蓮 (#SnowMan)        #菊池日菜子 https://t.co/GDS8DFhPmn

2023-01-23
Retweets: 15,227 Likes: 0 Engagement: 15,227

Key Insights & Takeaways

岩波書店は社会的議論を促進するためのプラットフォームとして機能しています。 投稿内容は主に思想、学術、社会問題に集中しています。 高エンゲージメントは知識欲の高い読者層からの反響を示しています。

Strengths

  • + Strong engagement rates above platform average
  • + Established follower base of 122,721
  • + Strong original content creation
  • + Active presence with consistent posting

Opportunities

  • ~ Optimize posting times for peak engagement windows
  • ~ Analyze top-performing content for replicable patterns
  • ~ Leverage geographic concentration for targeted content
  • ~ Explore collaboration potential with followed accounts

Summary

This analysis of @Iwanamishoten reveals an well-established Twitter presence with 122,721 followers. The account demonstrates a content-creator strategy, averaging 144.3 engagements per tweet. Key strengths include consistent posting and an engaged audience, with opportunities to further optimize timing and content strategy based on the patterns identified in this report.

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About This Analysis: This analysis is based on a snapshot of followers, following, and recent tweets. It evaluates structure, quality, and behavior, not historical growth. Metrics like growth rate, momentum, churn, or spike analysis require time-series data which is not available from a single snapshot.

Data collected and analyzed by twtData | Analysis date: Dec 16, 2025