Yahoo! is one of the biggest search engines and email providers on the Internet. The Yahoo! offers their users a searchable database where they can find people they know by using their search fields. This database will allow users to search by using people's names, where they are located, and by phone numbers. If you have the email address of the person you are looking for, you can use that to search the database too.
Go the Yahoo! main page. Click on the "More Yahoo! Services" tab on the left hand side of the screen. Click on the "People Search" tab and wait for the window to open.
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Enter the first and last name of the person you are looking for into the "First Name" and "Last Name" fields.
Enter the telephone number of the person you are looking for into the "Telephone" fields.
Enter the location of the person you are looking for into the "Location" field.
Click the "Search" button on the bottom right hand side of the screen.
Match the name of the person you are looking for with their Yahoo! ID. Narrow your search down by looking at the ages or specific locations listed with each person the search has returned.
Click on the name of the person you are looking for to get the full email address. The part before the "@yahoo.com" is their Yahoo! ID. For instance, if their email address is email@example.com then their Yahoo ID would be "guy34".