How to contact an exchange student in Lons le Saunier?

I took part in a french exchange in 1978 to Lons le Saunier and stayed with the wonderful famille Hergot and their daughter Christine. I want to try and get in touch with her to see how she's doing after all these years. Any suggestions as to how I should start? Names and e-mail addresses of local newspapers which I could write to? Exchange organisations in Lons with archive records?How to contact an exchange student in Lons le Saunier?Have you tried facebook?