Message object

{
"id": 191,
"source": "instagram",
"original_id": "108951331291402244",
"published_at": "2013-03-05T17:46:01+03:00",
"shortlisted_at": "2013-03-05T17:45:58+03:00",
"sender": {
"id": "455637162",
"username": "nick_name",
"fullname": "Full Name",
"picture": "http://example.com/profile_images/avatar.png"
},
"text": "Description of a post #with #hastags",
"media": [
{
"type": "image",
"thumb": "http://example.com/images/small-image.png",
"url": "http://example.com/images/large-image.png"
},
{
"type": "video",
"thumb": "http://example.com/videos/low-resolution.mp4",
"url": "http://example.com/videos/standard-resolution.mp4"
}
],
"tags": [
"gallery 1"
]
}

Image fields is present only if image of appropriate size is available in the tweet.