#21september
Live, measured metrics for the hashtag #21september from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #21september
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 2026-10-01 17:19 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 2026-10-01 17:19 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-10-01 17:19 UTCEverything below is measured over the latest 8 public posts (spanning ~61369 hours).
Posting hours (UTC)
Languages: English (8)
Avg boosts / post: 0.5
Top of the latest posts
I forgot that it was today but of course Youtube would not let me miss it. #21September #hololive https://www.youtube.com/live/N-RBlIBPbic
Night, now. https://youtu.be/131OjWrdYwc #EarthWindAndFire #21September #September
You did remember, yeah? #21september #music #nowplaying https://www.youtube.com/watch?v=Gs069dndIYk
What “21september” means
WikipediaSeptember is the ninth month of the year in the Julian and Gregorian calendars. Its length is 30 days.
“September” on Wikipedia (CC BY-SA) →#21september across platforms
every network with a public tag surfaceFollow #21september 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/21september