Face Blindness

I always had this really good memory when it came to people. I remember that I went to a festival in PA every year, and one year I saw someone that I had met in passing and I remembered their face, name, everything. I've always had that ability when it came to people. Of course not thinking about it, I assumed they'd remember me too, but they didn't at first. I never really understood why that happens to people, where they meet people and a few weeks later can't even remember their face. I assumed it was because in today's society, were so absorbed into phones and computers. At least now I know its not all because of that.