Okay, after reading the comment on the FB page, I cannot see ANY agency taking the time to investigate this. Since the poster appears to be in New Jersey or Pennsylvania, and the person being targeted by the "take him out comment" is in another state, this would be a long way to go for a local investigation (on a crime that may only be a misdemeanor). And the feds are not going to be interested in such an inane comment.

This comment is not going to be investigated based upon that single isolated comment. Move on.