My friend hacked his friends facebook?

hello my friends friend told a girl his pass and she told my Friend it and he hacked into it (because he was being mean) and posted farly mean stuff (like i eat dick,i liek it up the *** and i love pony dick and stuiped stuff like that) what is the worst that can happen because i look out for him and i dont want him to get in trouble like can he be changed and can they track it to is ip becasue we grew up to gether and he is like a brother to me thank you for your help.