[Meizicht]

Chocobo: It's happened to me too ( someone even pretended to be me on a random site and was destroying my reputation too, actually ) so I know the feel Dx
I have my photobucket in the same way, with every album password protected and everything. Only reason I'm on DA is because it's the only site my family checks ( and they like to see my progress; something they do to keep slightly in touch with me ) and I've got enough people to back me up that it wont be such a huge problem if something happens. @__@
( and the 29874298 signatures I hide in my drawings lolol )
I also keep a paranoid stock up of all my .sai versions with all the layers as proof. xD