ok ive had a couple calls where people came to complain that they were being harassed by someone. we cannot really do anything unless we can prove who is harassing you. the times i have had these calls the "text bombs" are sent from a web site or phone app.
while it is annoying and childish there really is nothing we can do. if this happened once then just move on. if it keeps happening then contact your phone provider and see about getting that phone number blocked or changing the number.
you can also contact facebook and ask them to remove the post. they might be able to help you out there.
i know for the few harassment cases ive had its normally a ex BF/GF who writes letters, stops by the house or work or calls multiple times over the course of a week or 2.
i really wish i could help brother but to be honest they didnt harass you they just annoyed you. let it go and smoke a stick and forget about them. glad everyone was ok and it was only a minor crash.
btw just a disclaimer i am in no way, shape or form offering legal advise. i am not a lawyer and am offering my opinion