Uploading AWS data onto facebook feed - iphone

We have a video capturing device, which uploads 20 MB clips to the cloud (on AWS S3). These clips are displayed on an iPhone app directly from the AWS S3 data.
We want to provide the user an option to share these feeds onto facebook. For doing so we want to avoid downloading the video locally onto the phone, and rather upload the data directly from cloud to facebook feed.
What are our options for uploading videos directly from the S3 onto user's facebook profile?
Since the only requirement here is to upload the video, I am trying to avoid developing a full fledged facebook app on the cloud. https://aws.amazon.com/facebook-application-hosting/

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