First Time Ever

[ithildin]

I ran into somebody I don't know using one of my icons, as her default actually, which is cool. I didn't realize some of my icons had drifted out to third and fourth generation users [g] However, I went to her LJ, and come to find she hasn't credited me, or anyone else, whose icons she's using. So I'm wondering if I should pass on to her that it's good LJ netiquette to credit icons or not? It's not a big deal, just wondering since I've never run into the situation before.