The problem is that if you make the album public anybody could add anything. For example I just added a new picture to you Paris album (of Paris), but could have just of easily added something pornographic.

Yes you can delete it, but unless you monitor it 24/7 it will stay up until you delete it. Two solutions:

1. Have all photos submitted from people other then the owner go to a holding folder for approval by the owner, before they are published to the main folder. 2. A really good filter that will filter out pornographic images (you may or may not allow this to be turned off).