It usually doesn't have anything to do with personal passwords. Myspace was hacked a few months ago and every single picture, private or otherwise, was grabbed. That was a breach and pull of their database though, not through personal accounts. Same thing with account breaches though; it is entirely the fault of their crappy login procedure, not the complexity of passwords.

Photobucket has even worse security and you can pull anything from any account just by playing with URLs and educated guesses on naming conventions. It's absurd.

If you absolutely don't want it seen, don't put it online. If you'd rather not have it seen, don't worry about it. It probably won't be, and even if it is, it's a drop in the planet sized ocean of material out there.