#september21
Live, measured metrics for the hashtag #september21 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #september21
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 2026-08-02 15:59 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 2026-08-02 15:59 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-08-02 15:59 UTCEverything below is measured over the latest 18 public posts (spanning ~26311 hours).
Posting hours (UTC) — busiest: 11:00
Languages: English (17)
Avg boosts / post: 3.7
Top of the latest posts
It's #September21 💃 🕺 🪩 (credit: Demi Adejuyigbe https://www.youtube.com/@demiadejuyigbe he stopped making them, i think this one in 2019 is his best and of course, the OG #EarthWindandFire: https://youtu.be/Gs069dndIYk )
Today, September 21, love was changing the minds of pretenders while chasing the clouds away 💛 ☁️ (Earth, Wind & Fire's "September", 1978) #September21 #EarthWindAndFire #21stNightOfSeptember
It is time. #September21 https://youtu.be/Gs069dndIYk
What “september21” 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) →#september21 across platforms
every network with a public tag surfaceFollow #september21 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/september21