One of the annoying things about Facebook is the way it displays photos: at a very low resolution! You can upload photos at full resolution, but with Facebook you can only get a fairly low-res 600×450 (approx) resolution.
What I want to know is — why? Why this ridiculous restriction? Every other online photo service which I’ve used (Yahoo! Photos and Flickr) let you download the full resolution.
The only thing I can think of is that if people can’t download the full resolution photo from Facebook, they’ll be forced to use Facebook’s “Photo Prints” service (at least, I think Facebook has one!). But they could at least give you the option of getting photos in a slightly higher res (i.e., 1024 x 768) without too much fear of people doing that. And other photo sites offer you the option of getting prints and downloading the full-resolution version.