What type of software stops menacing "people" in games like Yoville?

I met a guy once on Yoville who had software to stop “threatening” avatars and abusive people in their tracks. It was quite useful. I have heard that some people hack your account on games such as this as well as cause general issues with your computer? I was sent a fake gift which caused my computer to nearly crash. Does any one know what type of software this guy used? I need to get some of that!