Your friend must first want to be located. As many people don't want to be contacted. There are web searches that entail costs and some that don't. Doyou know where they were last known to be living? Start from a known point and work forward contacting common associates/friends. If your friend is associated with certain groups or organizations inquire there. Put your own name out there on the most popular sites like Facebook or Twitter and see if you can find common links or are contacted by your friend.
