#Marc21
Live, measured metrics for the hashtag #Marc21 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #marc21
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.
Day-by-day usage
measured · mastodon.online (Mastodon public tags API) · fetched 2026-10-15 22:07 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · mastodon.online (Mastodon public search API) · fetched 2026-10-15 22:07 UTCLive pulse
measured · mastodon.online (Mastodon tag timeline) · fetched 2026-10-15 22:07 UTCEverything below is measured over the latest 40 public posts (spanning ~33741 hours).
Posting hours (UTC) — busiest: 17:00
Languages: English (25) · German (6) · Dutch (4) · Spanish (3) · Finnish (1) · French (1)
Avg boosts / post: 1.6
Top of the latest posts
A small contribution at the intersection of libraries and data analysis: "marcxmlr" is now on CRAN. 📚📊 It brings MARC 21 XML into R without flattening away the structure that makes MARC, well… MARC: repeated fields and subfields, indicato
@anj it is not exactly what you have asked, but if having a marc21 document in a tabular form makes your life easier and you are confortable with R, have a look at https://cran.r-project.org/web/packages/marcxmlr/index.html and https://gith
National Library of Israel Authority Record: Joleford Arrojo The National Library of Israel (NLI) has published and integrated the official library authority record for Filipino author and digital publisher Joleford Arrojo into the Israel N
What “marc21” means
Wiktionarymarc/mɑːk/
- nounThe refuse matter that remains after fruit, particularly grapes, has been pressed.
#marc21 across platforms
every network with a public tag surfaceFollow #marc21 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.
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/marc21