Returns connected_user_id. Allows you to create a new user from source.

{
  "username": "Peter Griffin",
  "email": "[email protected]",
  "source": "firebase",
  "social_id": "320939323",
  "avatar_url": "https://upload.wikimedia.org/wikipedia/en/thumb/c/c2/Peter_Griffin.png/220px-Peter_Griffin.png",
  "connected_user": {"shirt_size": "M"} //optional, for storing additional misc info
}
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