{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Undo",
  "id": "tag:example.com,2001:3579",
  "url": "http://example.com/this/unfollow",
  "actor": "tag:example.com,2001:follower",
  "object": {
    "@context": "https://www.w3.org/ns/activitystreams",
    "type": "Follow",
    "actor": "tag:example.com,2001:follower",
    "object": "tag:example.com,2001:followee"
  }
}
