#worldcat
Live, measured metrics for the hashtag #worldcat from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #worldcat
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.social (Mastodon public tags API) · fetched 2026-10-14 02:42 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.social (Mastodon public search API) · fetched 2026-10-14 02:42 UTCLive pulse
measured · mastodon.social (Mastodon tag timeline) · fetched 2026-10-14 02:42 UTCEverything below is measured over the latest 40 public posts (spanning ~119534 hours).
Posting hours (UTC) — busiest: 15:00
Languages: English (31) · German (5) · Japanese (1) · French (1) · Catalan (1) · Dutch (1)
Avg boosts / post: 1.4
Top of the latest posts
Has #Worldcat fully retreated behind log-in with user accounts? Trying to access titles by their #OCLC ID from our institutional IP range at HU Berlin, I get the following response: ``` <head> <link rel="stylesheet" href="resource://content
Dear #library bubble, does anyone know of a resolver for #OCLC IDs that is not #Worldcat? Worldcat decided to block all IPs coming from my #VPN service. #DH2025
📬 Anna’s Archive unter Druck: US-Gericht ordnet dauerhafte Unterlassung an #EBooks #Rechtssachen #Anna’sArchive #Browsewrap #DomainSperre #HostingAnbieter #Intermediäre #OCLC #Schattenbibliotheken #Scraping #Unterlassungsverfügung #USGeric
What “worldcat” means
WikipediaWorldCat is a union catalog that itemizes the collections of tens of thousands of institutions, in many countries, that are current or past members of the OCLC global cooperative. It is operated by OCLC, Inc. Many of the OCLC member libraries collectively maintain WorldCat's database, the world's largest bibliographic database. The database includes other information sources in addition to member library collections. OCLC makes WorldCat itself available free to libraries, but the catalog is the
“WorldCat” on Wikipedia (CC BY-SA) →#worldcat across platforms
every network with a public tag surfaceFollow #worldcat 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/worldcat