The predecessor of Yahoo! People search was four11, a famous guide to people search sites. It was named after the number of telephone directory service in the United States was 411, and was later acquired by Yahoo. Four11 has strong search ability and friendly user interface, and was continuously rated as "excellent guide to people search sites" by PC Magazine in 1996 and 1997 。 Yahoo search mainly provides e-mail search, telephone number query, e-mail advanced search, yellow page search and other functions.
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