@ttmonday the format outside of iMessage is BLUR image plus link. That link currently redirects to a page that tells you to upgrade :)
Obviously in the future there can be more elegant ways of providing messaging functionality even outside of iMessage but for right now, we say let's start with the iMessage platform and that's iOS 10 only.
Secret Photo Vault
Social Friendzy
Secret Photo Vault
AppealSeal
Secret Photo Vault