How do you find someone on Facebook?

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Use all the information you have as filters for your search. You might recognize a photo which would be enough to friend that person and perhaps find some of the other persons on his/her friends list in no time. A surname would definitely help, because it might be unique (not to mention email addresses) while first names are not. You can also check places/travel maps and attractions you went together to, because any of those persons might have added a photo with the correct location that could also be used as a starting point. Due to the thousands of visitors, however, there is no guarantee, and it might happen that you will never find them. In such a scenario, you need some luck too.