#XXI

Live, measured metrics for the hashtag #XXI from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

hashtag.org network · sponsored

Own #xxi

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.

$5,313.74/ year · 3-character #name
Claim #xxi — $5,313.74/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
11
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 11
0
Avg reactions / post
Mastodon · last 11
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-10-28 01:11 UTC
0
10-22
0
10-23
0
10-24
0
10-25
0
10-26
0
10-27
0
10-28

0 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 2026-10-28 01:11 UTC
#xxiivv
1 uses · 1 accounts / 7d
#xxivoldbuildings
0 uses · 0 accounts / 7d
#xxivedicion
0 uses · 0 accounts / 7d
#DemokracjaXXI
0 uses · 0 accounts / 7d
#xxixderechoygenoma
0 uses · 0 accounts / 7d
#XXIVEncuentroNacionalDeSolidaridadConCuba
0 uses · 0 accounts / 7d
#AssociacióPalmaXXI
0 uses · 0 accounts / 7d
#xxiv
0 uses · 0 accounts / 7d
#xxii
0 uses · 0 accounts / 7d
#xxicommonwealthgames
0 uses · 0 accounts / 7d
#xxiiicommonwealthgames
0 uses · 0 accounts / 7d
#AfriqueXXI
0 uses · 0 accounts / 7d

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-10-28 01:11 UTC

Everything below is measured over the latest 11 public posts (spanning ~54289 hours).

Posting hours (UTC)

00:0012:0023:00

Languages: Spanish (4) · German (3) · English (2) · Italian (1) · Russian (1)

Avg boosts / post: 0.3

Top of the latest posts

  • Hemos convertido los probióticos en la pastilla milagrosa del siglo #XXI. La #ciencia tiene algo que decir al respecto https://www.xataka.com/medicina-y-salud/hemos-convertido-probioticos-pastilla-milagrosa-siglo-xxi-ciencia-avisa-que-tomar

    Claudio C@[email protected]♥ 0↻ 02026-06-14 21:00 UTCView post →

  • Una conversación sobre #CienciaAbierta y #Datos #FAIR con Carmen Reverté #XXI workshop proyectos digitales los datos como sustento de la investigación: planes de gestión de datos, publicación, trazabilidad y principios FAIR

    Paco Mar @pacobib@[email protected]♥ 0↻ 12026-05-28 14:37 UTCView post →

  • El Galileo Galilei del siglo #XXI es un señor desconocido que ha descubierto más lunas de las que nadie va a descubrir ya https://www.xataka.com/espacio/galileo-galilei-siglo-xxi-senor-desconocido-que-ha-descubierto-lunas-que-nadie-va-a-des

    Claudio C@[email protected]♥ 0↻ 02025-07-28 20:00 UTCView post →

What “xxi” means

Wikipedia

21 (twenty-one) is the natural number following 20 and preceding 22.

“21 (number)” on Wikipedia (CC BY-SA) →

#xxi across platforms

every network with a public tag surface

Follow #xxi 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.

X (Twitter) ↗Instagram ↗TikTok ↗Facebook ↗LinkedIn ↗YouTube ↗Threads ↗Bluesky ↗Mastodon ↗Reddit ↗Pinterest ↗Tumblr ↗

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/xxi