Which web-site on the internet is legit...?

Question

for finding a person via their First and Last Name, Phone Number, DOB, SSN????

Answer 1

There are about 17 nation-wide phone directories. Most offer a reverse direcory lookup; you enter the number, it tells you who it is registered to. They all will let you look up people by name, although it helps to know the town.

zabasearch is the one we usually reccomend for living people.

There shouldn't be one available to the public for SSN lookups.

Answer 2

What Ted said for the living.  For the dead you can find their SSN or their info by their SSN on the Social Security Death Index if (and only if) they ever drew Social Security or somebody ever drew it on their account.

http://ssdi.rootsweb.ancestry.com/