#checkbox21
Live, measured metrics for the hashtag #checkbox21 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #checkbox21
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 2026-10-19 02:19 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 2026-10-19 02:19 UTCNo related tags with measured usage found for #checkbox21.
Live pulse
measured · Mastodon tag timeline · fetched 2026-10-19 02:19 UTCNo recent public posts found for #checkbox21 on Mastodon. Nothing measured, so nothing shown.
What “checkbox21” means
Wiktionary · Wikipediacheckbox/ˈtʃɛkbɒks/
- nounA space on a paper form that can be optionally filled with a check mark.
A checkbox is a graphical widget that allows the user to make a binary choice, i.e. a choice between one of two possible mutually exclusive options. For example, the user may have to answer 'yes' (checked) or 'no' on a simple yes/no question.
“Checkbox” on Wikipedia (CC BY-SA) →#checkbox21 across platforms
every network with a public tag surfaceFollow #checkbox21 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/checkbox21