Honestly by now anyone who puts a picture online knows they should expect it to be stolen. Nothing is sacred which is why if it means something to you it should be kept in a private album or soemthing of the sort.

I know Photobucket has private and guest settings. If you don't tag or name your pictures they can be hard to find from the search menu anyway. Making them private ensures they don't show up in the site search and I'd assume Google either.