#ActivityPub

Live, measured metrics for the hashtag #ActivityPub 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 #activitypub

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.

$10.85/ year · 11-character #name
Claim #activitypub — $10.85/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
93
Uses / 7 days
Mastodon
84
Accounts / 7 days
Mastodon
40
Recent posts
Mastodon
~0.5/hr
Recent pace
Mastodon · last 40
0.8
Avg reactions / post
Mastodon · last 40
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-09-07 20:50 UTC
16
09-01
11
09-02
19
09-03
14
09-04
13
09-05
10
09-06
10
09-07

93 uses by 84 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 2026-09-07 20:50 UTC
#activitypubs
0 uses · 0 accounts / 7d
#activitypubdev
1 uses · 1 accounts / 7d
#activitypubapi
1 uses · 1 accounts / 7d
#wordpress_activitypub
0 uses · 0 accounts / 7d
#activitypubrelay
0 uses · 0 accounts / 7d
#activitypubmeta
0 uses · 0 accounts / 7d
#activitypubhub
0 uses · 0 accounts / 7d
#activitypubnetwork
0 uses · 0 accounts / 7d
#activitypubclient
0 uses · 0 accounts / 7d
#activitypubbot
0 uses · 0 accounts / 7d
#activitypubplugin
0 uses · 0 accounts / 7d
#activitypubsocial
0 uses · 0 accounts / 7d

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-09-07 20:50 UTC

Everything below is measured over the latest 40 public posts (spanning ~79 hours).

Posting hours (UTC) — busiest: 13:00

00:0012:0023:00

Languages: English (27) · German (4) · French (2) · Spanish (2) · Dutch (1) · Japanese (1)

Avg boosts / post: 3.5

Top of the latest posts

  • Should publishing with ActivityPub be about as easy as publishing with RSS? #EvanPoll #poll #ActivityPub #RSS #publishing

    Evan Prodromou 🇨🇦🇺🇸🇬🇷🇵🇸@[email protected]♥ 6↻ 232026-09-04 22:02 UTCView post →

  • Public Messaging Platforms ‣ Simple: Plain old website with #RSS feeds ‣ Emergency Alerts: #CAP (Common Alerting Protocol) + delivery backends like #CellBroadcast ‣ Microblogging: #Mastodon (AP) ‣ Long form content: #WordPress + AP plugin ‣

    Gokul Das@goku12♥ 5↻ 22026-09-06 12:40 UTCView post →

  • @evan Yes, but... I understand the RSS and Atom specs well enough that I've created programs with RSS/Atom feeds. But the ActivityPub spec scares the willies out of me. Too many moving parts. #ActivityPub #RSS #Atom

    Bob Jonkman@[email protected]♥ 4↻ 72026-09-05 15:28 UTCView post →

#activitypub across platforms

every network with a public tag surface

Follow #activitypub 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/activitypub