SSN for non US citizen

Unless you are a noncitizen who wants to work in the United States, you probably do not need a Social Security number.

Generally, only noncitizens authorized to work in the United States by the Department of Homeland Security (DHS) can get a Social Security number. Social Security numbers are used to report an individual’s wages to the government and to determine a person’s eligibility for Social Security benefits. You need a Social Security number to work, collect Social Security benefits and receive some other government services.

http://www.socialsecurity.gov/pubs/10096.html