#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 · fosstodon.org (Mastodon public tags API) · fetched 2026-07-27 19:59 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-07-27 19:59 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-07-27 19:59 UTCEverything below is measured over the latest 34 public posts (spanning ~32125 hours).
Posting hours (UTC) — busiest: 16:00
Languages: English (21) · German (6) · Dutch (3) · Spanish (2) · Finnish (1) · French (1)
Avg boosts / post: 1.7
Top of the latest posts
BIBFRAME Must Die by Jeff Edmunds 👉 October 15, 2023 marks the 21st anniversary of Roy Tennant's article "MARC Must Die." With a nod to #MARC21, this article argues that #BIBFRAME is not the way forward for bibliographic description and of
Today I released version 0.5.0 of marc21-rs. It includes three new commands: `glimpse`, `grep`, and `skosify`. The `skosify` command is just the beginning and will be expanded with additional features in the coming weeks. Stay tuned. https:
Just released version 0.1.0 (pre-alpha) of polars-marc21 — a polars io plugin for reading MARC21 files. It is based on the MARC21 parser and the query engine from marc21-rs. I would appreciate any feedback, new ideas, or reports of errors.
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