Report content or members to group moderators

[mayel]

"As a group member, I want to report problematic content or behavior to the group's moderators specifically, rather than (or in addition to) instance admins."

We need group-scoped flagging with:

• Separate reports queue per group
• Reports can go to group mods, instance admins, or both
• Mods can escalate to instance admins

Suggested representation:

Use the existing Flag activity addressed to the group, and with moderators (or moderator collections in cc for broad compatibility:

{
  "type": "Flag",
  "actor": "https://remote.example/users/reporter",
  "object": "https://example.org/posts/problematic",
  "to": "https://example.org/groups/1",
  "cc": ["https://example.org/groups/1/attributedTo", "https://example.org/actors/alice"],
  "content": "This violates the group's code of conduct"
}

The group's home server:

1. Receives the Flag in group's inbox
2. Routes to group moderators
3. Optionally can be escalated to instance admins

Open questions:

• Should we expose inbox (depending on permissions verified by HTTP Signatures) for cross-instance moderation?
• Standard vocabulary for report reasons?

[trwnh]

this has some crossover with swicg/activitypub-trust-and-safety#24 -- the group could receive Flag activities directly but it might be moderated by some other entity (e.g. in a hosted service scenario)