#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
69
Uses / 7 days
Mastodon
64
Accounts / 7 days
Mastodon
40
Recent posts
Mastodon
~0.5/hr
Recent pace
Mastodon · last 40
1.5
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 2026-09-13 07:42 UTC
10
09-07
15
09-08
14
09-09
9
09-10
9
09-11
8
09-12
4
09-13

69 uses by 64 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 2026-09-13 07:42 UTC
#activitypubapi
0 uses · 0 accounts / 7d
#activitypubdev
0 uses · 0 accounts / 7d
#activitypubs
0 uses · 0 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 2026-09-13 07:42 UTC

Everything below is measured over the latest 40 public posts (spanning ~87 hours).

Posting hours (UTC) — busiest: 11:00

00:0012:0023:00

Languages: English (24) · German (7) · Swedish (1) · American English (1) · French (1) · Danish (1)

Avg boosts / post: 5.5

Top of the latest posts

  • RE: https://mastodon.social/@dansup/117246306213045632 I swore not to speak about #FediHood any more, but what #Pixelfed is doing is great news for #ActivityPub. Pixelfed already sends the location as a Place object with latitude and longit

    Fedilab Apps@[email protected]♥ 30↻ 182026-09-11 20:41 UTCView post →

  • Mangrove reviews now speak ActivityPub. Follow any subject or reviewer from Mastodon or any other Fediverse app, and new reviews land in your timeline as posts. Look for the Follow button next to a subject or a reviewer on https://mangrove.

    Open Reviews Association@[email protected]♥ 13↻ 192026-09-11 20:41 UTCView post →

  • I see quite a lot of webfinger requests to my ActivityPub server with the User Agent set to "Identity Collector/3.0.0 (+local defensive OSINT collector)". Anyone knows what that is about? #ActivityPub #webfinger

    Peter Makholm@pmakholm♥ 5↻ 92026-09-10 07:48 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