[haxplorer]

I've been through this precise problem both from a developer's as well as a consumer's standpoint.

As a developer, when we built Unifyphotos(http://export.goyaka.com/) to transfer photos from flickr to facebook, and got some traffic peaks, it was lot of work to scale up the download_from_flickr -> scale_photos -> upload_to_Facebook process, and we had 6 machines just doing this. Wish Filepicker.io was there back then. We could just have worried about the features and not the infrastructure. Even better, if Facebook used Filepicker, there would have been no need for a service to migrate those photos.

From a consumer side, I've often had to download my Facebook profile pic and upload as profile pic on sites like trello, basecamp, etc. If only they used Filepicker.io...