If you use Imageshack, or Imgur "no user registration" is required. There is no way to easily link you back. If you want to "add" credibility at the Gen sites for Gen sales, set-up an actual Photobucket (be sure to keep it all Gen, and throw in album with some kids photos-- LOL). PP should not be an issue at all unless your PP is somehow associated with your username on the rep side. If you have made it as far as PP with the person, I think you are fine.
Finally, if you don't deal with Gen's & Re-sale, then this is moot I suppose.