#21st

Live, measured metrics for the hashtag #21st 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 #21st

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.

$2,449.80/ year · 4-character #name
Claim #21st — $2,449.80/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
13
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 13
0.5
Avg reactions / post
Mastodon · last 13
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-08-01 13:46 UTC
0
07-26
0
07-27
0
07-28
0
07-29
0
07-30
0
07-31
0
08-01

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 2026-08-01 13:46 UTC
#otdjuly21st
0 uses · 0 accounts / 7d
#EnglishShortStories21stCentury
1 uses · 1 accounts / 7d
#ny21st
0 uses · 0 accounts / 7d
#june21st
0 uses · 0 accounts / 7d
#east_21st_street
0 uses · 0 accounts / 7d
#HowToDieInThe21stCentury
0 uses · 0 accounts / 7d
#AmericanScienceFiction21stCentury
0 uses · 0 accounts / 7d
#october21st2023
0 uses · 0 accounts / 7d
#21stCenturyLife
0 uses · 0 accounts / 7d
#ihitwestvanargyle21st
0 uses · 0 accounts / 7d
#kh21st
0 uses · 0 accounts / 7d
#august21st2023
0 uses · 0 accounts / 7d

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-08-01 13:46 UTC

Everything below is measured over the latest 13 public posts (spanning ~76881 hours).

Posting hours (UTC) — busiest: 17:00

00:0012:0023:00

Languages: English (11) · German (1)

Avg boosts / post: 0.9

Top of the latest posts

  • Picking up my son, his partner & the kids from Barnawartha which makes me the designated driver for the trip into town to go to the 21st dinner for my grandson - yippee 😂. Actually I prefer it that way. Just about ready to leave. #21st

    Heather Evans@[email protected]♥ 5↻ 32025-12-29 06:18 UTCView post →

  • according to #Nikolai_Kuleba, head of the #Save_Ukraine organisation. "The way they describe our children is no different from a slave catalogue. This is real child trafficking in the #21st century, which the world must stop immediately," h

    Putin's IBS@[email protected]♥ 2↻ 12025-08-07 17:12 UTCView post →

  • The EU's 21st Russia Sanctions Package Stalls, Again, as Member States Defend Their Own Interests Follow us and never miss a story. https://1ban.news/eu-21st-russia-sanctions-stall/ #1ban #21st #russia #sanctions #stall #geopolitics

    1ban.news@[email protected]♥ 0↻ 12026-07-23 09:55 UTCView post →

What “21st” means

Wiktionary

st

  • interjectionExpressing a sudden desire for silence.
Full entry on Wiktionary →

#21st across platforms

every network with a public tag surface

Follow #21st 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/21st