Photosync is a very simple web app that lets you sync Facebook and Flickr photos. If you’re too lazy to upload photos to both Facebook and Flickr accounts, or can’t really decide where you want to upload first, simply give Photosync access to both accounts and you won’t have to worry anymore.
What the app does is that it constantly checks your Flickr account for new photo uploads. Any time you upload more photos to Flickr, they will automatically be copied over to Facebook within an hour. The service is free and you can start using it by clicking the link below.