"Spoofing" stand for making believe other people.
If you only make belive other people, it does not become crimes.
But if you do bad thing,for example, speaking ill of other people or demanding money, after "spoofing",it becomes crimes.
And you should manege your password of your account certainly because if you do not that, other people may log in and abuse your account.
And these days,the danger of 'phishing', that requir their account id and passward, is increasing,so you should be careful about.