This seems pretty interesting - it's a good opportunity for sites like Flickr and the like to allow 'Facebook Zip' uploads and they'll automatically parse out your photos and store them in your account.
It's not clear to a lot of people 'what exactly' they are sharing when they link accounts, but when you upload a .zip, you are ONLY sharing what's contained in that file - there really is a big difference between uploading and linking =p