Yeah, I've done that many times - find an "old friend" on Facebook or Myspace or Classmates and written to them. One of the girls I had a crush on in High School is now living with her female "life partner" after being married and having two daughters. Another High School gal friend is now living about 20 miles from me and I had NO idea until I wrote to her on Classmates.
I say "write to the girl." You are probably afraid of "being rejected" but... nothing ventured, nothing gains.
