It Is Common for Employers to Use Social Media,such as Facebook

It is common for employers to use social media,such as Facebook and LinkedIn,to find positional applicants.What is the problem with this using these platforms?

A) If the applicant does not authorize the employer's use of social media,it is an invasion of privacy.
B) Facebook and LinkedIn users often do not list valid credentials.
C) It allows the employer access to information it could not ask the applicant in an interview.
D) It is against federal law for employers to use social media prior to receiving interest from an applicant.
E) Facebook and LinkedIn users do not represent the U.S.or global job-applicant pool.