洪民憙 (Hong Minhee): Calling all #fediverse developers for help: I'm currently trying to implement a #reporting (#flag) feature for Hackers' Pub, an #ActivityPub-enabled community for software engineers. Is there a formal specification for how cross-instance reporting should work in ActivityPub? Or, is there any well-documented material that explains how the major implementations handle it? #fedidev #mastodev #askfedi

Syntax	Description	Examples
`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
`from:` handle	Finds content written by the specified user.	`from:hongminhee` `from:hongminhee@hollo.social`
`lang:` ISO 639-1	Finds content written in the specified language.	`lang:en`
`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

洪民憙 (Hong Minhee) @hongminhee@hackers.pub

12/19/2025, 10:27:03 AM

Public

Calling all #fediverse developers for help: I'm currently trying to implement a #reporting (#flag) feature for Hackers' Pub, an #ActivityPub-enabled community for software engineers. Is there a formal specification for how cross-instance reporting should work in ActivityPub? Or, is there any well-documented material that explains how the major implementations handle it?

#fedidev #mastodev #askfedi

Hackers' Pub

Hackers' Pub is a place for software engineers to share their knowledge and experience with each other. It's also an ActivityPub-enabled social network, so you can follow your favorite hackers in the fediverse and get their latest posts in your feed.

hackers.pub

If you have a fediverse account, you can reply to this note from your own instance. Search https://hackers.pub/ap/notes/019b3626-1448-76b3-b205-e832ac405da9 on your instance and reply to it.

Emelia @thisismissem@activitypub.space

12/19/2025, 10:32:27 AM

Public

It's somewhere on my todo list as an output of the T&S taskforce

silverpill @silverpill@mitra.social

12/19/2025, 7:24:00 PM

Public

@hongminhee洪民憙 (Hong Minhee) There was a thread on SocialHub https://socialhub.activitypub.rocks/t/how-do-account-reports-federate-is-there-sample-data/2813

How do account reports federate? (Is there sample data?)

Mastodon does have the ability to file a report about an account and posts. These reports can also be transferred to the account’s own server. I saw on ActivityPub - Mastodon documentation that Flag is used for these reports. The activity itself is described here: Activity Vocabulary Question is only, how this is exactly implemented. Is there any sample data? Thanks!

socialhub.activitypub.rocks · SocialHub