The Twitter API documentation for GET users/profile_image/:screen_name states that:
This method should only be used by application developers to lookup or check the profile image URL for a user. This method must not be used as the image source URL presented to users of your application.
This API call returns a 302 redirecting to the profile image url. What is the best practice to make those images available for ones application? The easiest way it seems, would be to use the resulting url string and embbed it in the apps html code (e.g. in the src of an img tag). The alternative would be to store the image locally as a file or in a blob field.
Is linking the image covered by the "must not" or does that mean that you shall not call the API, but you do can use the resulting url?