Indeed, by opening the API, Facebook allows one to import from other services. Adding Twitter to the Facebook apps was genius. Later, I may be able to import my Flickr photos and check my gmail. Facebook was a curiosity at best for me prior to opening up the API. Now, it is a useful means of connecting to people.

I think they could improve the service by not requiring users to double-upload their content. If they could facilitate share from anywhere, it would go a long ways.