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You know, if the person directly links to the person's avvie, you can find out who they are by inputting the number before the underscore into the link for user's profiles. So, you would take this:
and voila! You got the person with what looks to be Korean characters as their username :3
Now, if you upload the image to something like Tinypic (not too hard, though you'd have to save the image to your computer first), you can effectively make it harder~ La dee dah, don't mind me and my explanations~