#day21
Live, measured metrics for the hashtag #day21 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #day21
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 2026-09-30 07:46 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 2026-09-30 07:46 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-09-30 07:46 UTCEverything below is measured over the latest 40 public posts (spanning ~22642 hours).
Posting hours (UTC) — busiest: 17:00
Languages: English (24) · Spanish (8) · Portuguese (2) · German (2) · French (1)
Avg boosts / post: 0.5
Top of the latest posts
I'm almost back on track with the #30DayChartChallenge with another trio of plots - this time all made from scratch in D3! I learned how to: 📊 Make scatter plots, line charts, and area charts 💡 Highlight and annotate specific data points
#30DayMapChallenge 2023 #day21 Raster Represented elevation colors for Alaska, image provided by Data: QGis Sample Data Tool: #R #rspatials #rstas #datascience #maps #spatials
Earthquakes Yearly Avg Magnitude 6+ (1900–2013) 🌍 Centroids marked with flag icons for #Day21 Icons. Data: USGS Map: Federica Gazzelloni #30DayMapChallenge #RStats #GIS #Earthquakes #DataViz
What “day21” means
Wiktionary · WikipediaA day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours. As a day passes at a given location it experiences morning, afternoon, evening, and night. This daily cycle drives circadian rhythms in many organisms, which are vital to many life processes.
“Day” on Wikipedia (CC BY-SA) →#day21 across platforms
every network with a public tag surfaceFollow #day21 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/day21