{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "Sally and Joe offered the Foo object",
  "type": "Offer",
  "actor": [
    "http://joe.example.org",
    {
      "type": "Person",
      "id": "http://sally.example.org",
      "name": "Sally"
    }
  ],
  "object": "http://example.org/foo"
}