facebook feed not fetch image from particular s3 bucket

I am using the following url to share our website content to facebook stream

http://ift.tt/1OJSnFr

The facebook feed does not fetch the image from this bucket, If i change to other bucket then it fetches the images.

The bucket policy is

{
"Version": "2008-10-17",
"Id": "xxxxxxx",
"Statement": [
    {
        "Sid": "Allow get requests referred",
        "Effect": "Allow",
        "Principal": {
            "AWS": "*"
        },
        "Action": "s3:GetObject",
        "Resource": "arn:aws:s3:::bucketname/*"
    }
]

}

I can open the images in browser without any restrictions but only the facebook does not fetch the images...