{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "Sally offered the post to John",
  "type": "Offer",
  "actor": "http://sally.example.org",
  "object": "http://example.org/posts/1",
  "target": "http://john.example.org",
  "to": [ "http://joe.example.org" ]
}