Methods to find an old friend

I am searching for a dear friend of mine from Korea that I last had contact with in 2006. I have two email addresses for her but both are invalid. She has a very common name so searching Facebook also hasn't been fruitful. I know she graduated from Pusan University with a degree in computer science, likely in between 1997-1999. I obviously have pictures but not that those would be helpful. Anybody have any good ideas for sites or methods I could try?

Re: Methods to find an old friend

One other thing, I have pictures of me and my friend (and some of our other friends) from 2000-2001. Obviously people have changed since then but is it unethical to post those pics to a Korean message board and ask if anybody knows any of the people?