First of all, let's define "friend".

Do we want to find an "old" friend?

Lots of websites specialize in helping you find an "old" existing Friend.

These sites are called "classmates", "reunions", "public records" or names along the lines of trying to find acquaintances from way back, from school, the Service or previous jobs.

Do we want to find "people"?

We can use "publicbackgroundcheck", "usa-people-search", "peoplefinders" types of sites for finding people.

If, however, we are l

For the word "friendship" the Web comes up with 46,100,000 replies.

So we should be more specific about what exactly the "friend" word means. "a person you know well and regard with affection and trust; "he was my best friend at the university" ally: an associate who provides assistance; "he's a good ally in fight"; "they were friends of the workers" acquaintance: a person with whom you are acquainted; "I have trouble remembering the names of all my acquaintances"; "we are friends of the family" supporter: a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library" a member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers) "

wordnet.princeton.edu/perl/webwn