I just found out on another forum if you have not locked your Photobucket account it is open to the public. Apparently their default setting is for it to be open. You must login to your account and by your username there is a small padlock. If it is unlocked you need to lock it unless you desire it to be open for unrestricted access. Also go to privacy and edit your settings.

If your bucket isn't public what happens to your links to it in a forum like this?

will other users be able to view it or do you have to log-in to see it?