Locating Alumni Members

In a previous post, I mentioned about my aunt's upcoming high school reunion early next year. She's part of the committee in charge of getting in touch with alumni members. The committee has successfully invited sixty percent of the members but they still have to get in touch with the remaining forty percent. They have some little difficulty tracing some members who have changed their addresses and contact numbers. I was thinking they could try looking for these people through People Finder. It's a site that helps you locate people from different parts of the world.