Carnegie Mellon researchers are adapting a government algorithm to guess your SSN. The algorithm was developed to protect against fraudulent applications for SSNs. It uses birth date and the area you were born to come up with a likely match for the first few digits. The last few digits are harder to guess correctly. If the algorithm narrows down your details to just the last few and attack it with a brute force method, this could mean that people could forge your identity by using details you have on Facebook, coupled with a botnet.”]
Source: https://gizmodo.com/fraud-protection-algorithm-breeds-method-to-guess-ssn-u-5309318