I am trying to locate my grandfather or his family who are from Lebanon.?

My grandfather, whose surname is Khoury left when my dad and his sister were kids, so he has no information. My grandfather worked in Liberia in the 60s, where my dad was born, and I think worked for the American Emby. Even if he is dead, I would like to find his family, but I have no idea what town in Lebanon. I am guessing he is between 60-75, I don't know. I checked white pages, but there are too many with that name, even in Lebanon since its a common name. I plan to search in Lebanon, I have tried facebook, and online Lebanese white pages, but how else should I look?