how to find someone on facebook,orkut,twitter and other social networking sites?

[Harshit]

i hav a friend whom i hav to find on internet. don't now which social networking site he is in.
i know his name(don't know if its just his nick name), gender,where he lived and where he might be living(not sure about location of his current house but my guess can be right),his school(90% it's correct) and offcourse recognize his face. so how can i find hi?. he can be on facebook or orkut or twitter or other social networking site

[nishanth]

search his school first, then check whether you know anyone on that

[Jakob]

Try facebook first since it is the most famous socal network then try twitter then myspace