#isbn

Live, measured metrics for the hashtag #isbn from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

hashtag.org network · sponsored

Own #isbn

This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.

$2,449.80/ year · 4-character #name
Claim #isbn — $2,449.80/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
1
Uses / 7 days
Mastodon
1
Accounts / 7 days
Mastodon
40
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 40
0.5
Avg reactions / post
Mastodon · last 40
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · mastodon.social (Mastodon public tags API) · fetched 2026-09-28 20:36 UTC
1
09-22
0
09-23
0
09-24
0
09-25
0
09-26
0
09-27
0
09-28

1 uses by 1 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.

Related hashtags

measured · mastodon.social (Mastodon public search API) · fetched 2026-09-28 20:36 UTC
#ISBN1970
0 uses · 0 accounts / 7d
#ISBNdb
0 uses · 0 accounts / 7d
#ISBN9788282822114
0 uses · 0 accounts / 7d
#isbncanada
0 uses · 0 accounts / 7d
#isbn9783462051087
0 uses · 0 accounts / 7d
#isbn978
0 uses · 0 accounts / 7d
#isbn9784475017299
0 uses · 0 accounts / 7d
#isbn_978_3_455_00681_0
0 uses · 0 accounts / 7d
#ISBN9781534431003
0 uses · 0 accounts / 7d
#ISBN10
0 uses · 0 accounts / 7d
#ISBN13
0 uses · 0 accounts / 7d
#isbn1250214718
0 uses · 0 accounts / 7d

Live pulse

measured · mastodon.social (Mastodon tag timeline) · fetched 2026-09-28 20:36 UTC

Everything below is measured over the latest 40 public posts (spanning ~5824 hours).

Posting hours (UTC) — busiest: 13:00

00:0012:0023:00

Languages: English (28) · German (6) · Russian (2) · Chinese (Taiwan) (1) · Polish (1) · Greek (1)

Avg boosts / post: 1

Top of the latest posts

  • #1363 ISBN - International Standard Book Numbering: Incorporating Guidelines for Numbering Software Intended for Sale by Retailers. The Standard Book Numbering Agency Ltd, London, 1993, 7th revised edition. #ISBN #Publishing #Books #BookOfT

    Chris Bond@Vibracobra23♥ 9↻ 22026-08-13 18:29 UTCView post →

  • Hey writers, how about #ISBN, but decentralized? Without the payment, the copyright, or the doxxing? For new #zines , manuals, novels; political, personal, or just chill? Digital and paper? Is there any standard already which I just missed?

    dorotaC@[email protected]♥ 5↻ 32026-08-10 18:02 UTCView post →

  • One of my colleagues is facing challenges while applying for an ISBN in India for some of our works. If someone can help, please DM or email me. We'll compensate you for your time, of course. #ISBN

    Rohini Lakshané@rohini♥ 2↻ 92026-09-02 10:31 UTCView post →

What “isbn” means

Wikipedia

The International Standard Book Number (ISBN) is a numeric commercial book identifier that is intended to be unique. Publishers purchase or receive ISBNs from an affiliate of the International ISBN Agency.

“ISBN” on Wikipedia (CC BY-SA) →

#isbn across platforms

every network with a public tag surface

Follow #isbn straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.

X (Twitter) ↗Instagram ↗TikTok ↗Facebook ↗LinkedIn ↗YouTube ↗Threads ↗Bluesky ↗Mastodon ↗Reddit ↗Pinterest ↗Tumblr ↗

Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/isbn