You telling certain friends, but not others, based on characteristics named in the 1964 civil rights act, as part of your job requirements, would likely be illegal.

In your free time without occupational incentive? Sure.

No it would not be illegal.

What happens if all my friends happen to be black? I can never tell anyone about a job opportunity ever again?

Have we taken a step back and actually thought about the things we're saying?

When is it ever a job responsibility to tell your friends about job opportunities & no one else?