Susan Feinstein:

Darci Hemleb Thompson had been on the lookout for Alice D’Addario for many years. From her home in Hampton, Va., Ms. Thompson, 49, who is married and has a 12-year-old daughter, was determined to find Ms. D’Addario on the Internet. She tried every search engine and networking site she could find.
About 18 months ago she hit the jackpot.
“Nice to see one of the greatest teachers of all time on Facebook!” Ms. Thompson wrote on Ms. D’Addario’s wall. “I love to go to your page just to see your smiling face. Even your eyes still smile. You are an amazing person!”
Ms. D’Addario was Ms. Thompson’s Advanced Placement history teacher at Walt Whitman High School in Huntington Station, on Long Island, in 1977.