#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
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
40
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 40
0.2
Avg reactions / post
Mastodon · last 40
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · mas.to (Mastodon public tags API) · fetched 2026-10-19 07:51 UTC
0
10-13
0
10-14
0
10-15
0
10-16
0
10-17
0
10-18
0
10-19

0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.

Related hashtags

measured · mas.to (Mastodon public search API) · fetched 2026-10-19 07:51 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
#isbn1250214718
0 uses · 0 accounts / 7d
#ISBN10
0 uses · 0 accounts / 7d
#ISBN13
0 uses · 0 accounts / 7d
#isbn9780367898649
0 uses · 0 accounts / 7d
#isbn9781324002550
0 uses · 0 accounts / 7d
#isbn_0292727313
0 uses · 0 accounts / 7d

Live pulse

measured · mas.to (Mastodon tag timeline) · fetched 2026-10-19 07:51 UTC

Everything below is measured over the latest 40 public posts (spanning ~10414 hours).

Posting hours (UTC) — busiest: 17:00

00:0012:0023:00

Languages: English (23) · German (7) · Russian (2) · Hungarian (1) · Chinese (Taiwan) (1) · Polish (1)

Avg boosts / post: 0.9

Top of the latest posts

  • Die erwähnte ISBN-Analyse in der Wikipedia von @mathias : https://gruene.social/@mathias/113403754416368912 @awinkler @freakshow @johl #ISBN #Wikipedia

    Reise_Reise@[email protected]♥ 3↻ 12025-11-24 17:04 UTCView post →

  • Looks like public requests to the Google Books API now have a quota/rate of 0 per minute. RIP #google #googlebooks #isbn

    Lars Willighagen@[email protected]♥ 1↻ 02026-09-21 15:39 UTCView post →

  • I am currently migrating my #BookWyrm account for the first time (to @[email protected] , and it's definitely not the smooth process I am used to from my two Mastodon migrations. A lot of books required a second import attempt

    Jürgen Hubert@[email protected]♥ 1↻ 82026-09-18 04:47 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