{
  "@context": "https://www.w3.org/ns/activitystreams",
  "id": "http://...",
  "type": "Announce",
  "actor": 'http://sally.example.org',
  "object": {
    "type": "Create",
    "id": "http://...",
    "actor": "http://...",
    "object": {
      "type": "Note",
      "id": "http://..."
      "actor": "http://sally.example.org",
      "content": "..."
    }
  }
}